When 5mm Type Feels Too Small: Why 10mm Brass Letters Work Better on Larger Leather Goods
There is a point in leatherwork where a perfectly clean foil impression can still look… slightly wrong.
The foil transferred properly. The temperature was fine. The pressure was right. The letters are straight.
And yet, on a luggage tag, a large notebook cover, a handbag panel or a broad leather patch, the type can still feel a little lost.
That is usually not a machine problem. It is a proportion problem.
Most movable brass type used for leather hot foil stamping sits somewhere around the 3.5mm to 5mm range. That size is popular for good reason. It works beautifully on wallets, card holders, small labels and initials. It is discreet, easy to place and fairly forgiving.
But once the object gets larger, those same letters can start to look undersized.
Sometimes you simply need more type.
Not more words. More physical presence.
5mm Is Useful. It Just Is Not Universal
Smaller type is probably still the best everyday choice for a lot of leatherworkers.
If most of your work involves:
- card holders
- wallets
- pencil cases
- small key fobs
- discreet initials
- compact labels
then 3.5mm, 5mm or 6mm type is usually easier to live with.
The problem starts when the surface area grows.
Put the same 5mm lettering in the middle of an A5 notebook cover and there can be too much empty space around it. Put it on a large luggage tag and the wording may feel secondary when you actually wanted it to be part of the design.
There are makers in leatherworking communities looking specifically for larger alphabet sets because standard small sizes simply do not read strongly enough on bigger projects. The issue is not unusual. Reddit
That is where 10mm begins to make sense.
10mm Type Has Enough Visual Weight
The real advantage of 10mm brass type is not that it is louder.
It is that the scale starts to make more sense on larger objects.
Think of a luggage tag with a surname across the centre.
A notebook cover with a single word.
A leather portfolio with a name.
A handbag panel with a short piece of branding.
A large patch with a date or city name.
On those surfaces, 10mm lettering has enough presence to look intentional.
That distinction matters.
There is a big difference between text that looks as though it was added after the product was finished and text that feels like part of the original composition.
On larger leather goods, 10mm type often does the latter better.
The CÍ 10mm Brass Type Set was developed specifically as a larger format option for hot foil stamping and heat embossing. CÍ lists luggage tags, leather labels, keyrings, notebook covers and packaging among the main use cases for the set. CÍ OFFICIAL
Where 10mm Type Works Best
A rough guide:
| Project | 10mm Type |
|---|---|
| Card holder | Usually too large |
| Small wallet | Usually too large |
| Keyring | Good for short initials or one word |
| Luggage tag | Very suitable |
| A5 notebook cover | Very suitable |
| A4 folio or notebook | Very suitable |
| Handbag panel | Very suitable |
| Large leather patch | Very suitable |
| Presentation box | Very suitable |
| Long sentence | Usually not ideal |
That is worth saying clearly.
10mm is not an all purpose type size.
It is a large format size.
If you mainly make wallets, buying larger type simply because it looks more impressive on a product page would probably be the wrong decision.
If you regularly look at your finished work and think, “the lettering needs to be bigger”, that is a different story.
Bigger Letters Need a Proper Brass Body
Making larger type is not just a matter of enlarging a digital font and machining it into brass.
As the character gets larger, the physical construction of the type matters more.
The CÍ 10mm pieces use an overall body height of approximately 16mm, with a substantial brass base and a 3mm engraving depth. CÍ OFFICIAL
That extra mass matters for a few reasons.
First, it keeps a relatively large character stable in the holder.
Second, it gives the piece enough thermal mass to heat consistently during stamping.
And third, a larger body gives the raised character proper structural support instead of leaving a broad letter sitting on an undersized base.
Large lettering needs enough brass behind it. Simple as that.
The 3mm Engraving Depth Is More Important Than It Looks
This is probably the least glamorous specification on the page, but one of the more useful ones in practice.
The characters are engraved to a depth of around 3mm. CÍ OFFICIAL
Why bother going that deep?
Because leather compresses.
On a relatively firm vegetable tanned leather, the material may stay fairly flat around the raised character.
On softer leather, especially chrome tanned leather, bag leather or softer calfskin, the material can move and compress much more under pressure.
If the raised character does not sit far enough above the surrounding brass body, you can occasionally end up with unwanted marks from the base around the actual letter.
That is the last thing you want.
You want:
A
not:
[ A ]
The extra engraving depth creates more clearance between the character face and the body of the type.
The goal is simple: let the letter touch the leather without encouraging the rest of the block to join in.
CÍ specifically describes the deeper engraving as a way to create cleaner impressions on softer leather while reducing the risk of base marks. CÍ OFFICIAL
It does not mean you can ignore pressure, temperature and dwell time. Those still need to be adjusted for the leather and foil you are using. Leatherworkers working with chrome tanned leather regularly point out that there is no single universal temperature or pressure setting. Reddit
But good type geometry gives you a much better starting point.
Soft Leather Is Where You Notice This Most
Soft leather is a little less forgiving than people expect.
Press too lightly and the foil may not transfer cleanly.
Press too hard and the leather starts wrapping around parts of the stamp you did not want to see.
This is why engraving depth starts to matter more once you move away from firm tooling leather.
For handbags, softer notebook covers and other flexible leather goods, more clearance around the character face can make the setup noticeably easier to control.
It is a small manufacturing detail, but it has a very practical consequence.
Times New Roman Style Makes More Sense at 10mm Than You Might Expect
The standard version of the CÍ set uses a Times New Roman style serif face. CÍ OFFICIAL
At very small sizes, serif type can sometimes feel busy.
At 10mm, the details finally have some room.
The contrast between thick and thin strokes is more visible. The serifs read properly. The letters have more shape.
And because the design is familiar rather than aggressively stylised, it works across quite a wide range of objects.
It can sit comfortably on:
traditional leather goods
bookbinding work
notebook covers
luggage pieces
packaging
gift items
simple contemporary leatherwork
It does not force the finished object into one very specific visual language.
For a large type set, that versatility is useful.
Large Type Also Changes the Way You Write
There is another effect that becomes obvious once you start working with 10mm characters.
You stop trying to fit so much text.
That is usually a good thing.
Instead of:
HANDMADE ESPECIALLY FOR OLIVIA
you may end up with:
OLIVIA
Instead of:
MADE IN COPENHAGEN
you might simply stamp:
COPENHAGEN
The larger the type, the more important spacing and empty space become.
Fewer words can carry more visual weight.
That is part of the appeal.
Why a 307 Piece Set Still Matters With Large Type
Large type tends to be used for shorter words, but that does not mean a small alphabet set is always enough.
If you personalise products for customers, duplicate letters become a very real problem.
ANNA needs two As and two Ns.
MATTHEW needs two Ts.
LETTER needs two Ts and two Es.
People using brass alphabet sets for names regularly run into this exact issue. In one recent leatherworking discussion, a maker said they were limited to initials simply because they did not own enough duplicate letters. Others recommended keeping multiple copies of commonly used characters. Reddit
That is one reason a larger 307 piece set is useful.
It gives you enough letters, numbers and symbols to compose real names and short phrases without constantly breaking the layout apart.
That matters because setting the complete word once is usually easier than stamping one part, rebuilding the holder and trying to align a second impression perfectly.
Alignment problems are one of the most common frustrations with individual letter stamping in general. Leatherworkers often spend considerable effort keeping baselines and spacing consistent. Reddit
A type holder and a properly stocked character set remove a lot of that unnecessary drama.
And Then There Is the Storage Problem
Three hundred and seven brass pieces take up a surprising amount of room.
With 10mm type, each individual piece is physically larger too.
So storage stops being a nice extra fairly quickly.
It becomes part of the workflow.
The set can be ordered with a double layer walnut storage box, which is a much more sensible arrangement than spreading hundreds of pieces across a bench.
A proper box makes it easier to:
find characters quickly
keep numbers and punctuation separate
spot missing pieces
put everything away without resorting every character from scratch
use less bench space
There is something quite satisfying about a wooden type case, admittedly.
But the practical point matters more.
Once a type set gets this large, the box is not really packaging anymore. It is a working tool.
CÍ also offers the 10mm set without the wooden box, in which case a clear compartment box is supplied instead. CÍ OFFICIAL
So, Is 10mm Better Than 5mm?
No.
That is probably the wrong question.
10mm type is not an upgrade from 5mm type.
It solves a different proportion problem.
If your work is mostly small wallets and card holders, 5mm may be considerably more useful.
If you are moving towards luggage tags, journals, larger notebook covers, handbags, folios or large leather labels, then 10mm begins to feel much more natural.
It gives the lettering enough size to belong on the object.
And when that larger format is combined with a substantial brass body, 3mm engraving depth, a full character set and proper storage, it becomes a much more practical studio tool than simply “a very large alphabet”.
That is really the point.
Not bigger for the sake of bigger.
Big enough for the work.
About CÍ
CÍ is a curated leathercraft tool shop focused on well made, practical tools for serious makers and small studios.
Some products are developed and manufactured through our own production partners and factories, while others come from independent tool designers and specialist brands we work with closely.
The idea has always been fairly simple: bring together tools that are genuinely useful at the bench rather than filling a catalogue for the sake of it.
Alongside brass type and hot foil stamping equipment, you will find stitching punches, stitching ponies, leather skiving machines, cutting knives, edge tools, custom stamps and other workshop equipment.
We offer shipping to most parts of the world and provide long term after sales support for the products we sell.
CÍ has also collected more than 500 verified customer reviews from makers around the world. For a fairly specialised corner of leathercraft, that matters to us. Good tools are important, but being able to get help after buying them is part of the product too.
References
CÍ OFFICIAL (2026a) CÍ 10mm Brass Type Set for Hot Foil Stamping. CÍ OFFICIAL. Accessed 3 September 2026. CÍ OFFICIAL
CÍ OFFICIAL (2026b) Complete Hot Foil Stamping Solution. CÍ OFFICIAL. Accessed 3 September 2026. CÍ OFFICIAL
CÍ OFFICIAL (2026c) What Size Type Should You Use for Leather Hot Foil Stamping? A Practical Guide from 3mm to 10mm. CÍ OFFICIAL. Accessed 3 September 2026. CÍ OFFICIAL
Reddit (2026a) ‘How do you decide # letters for stamps’, r/Leathercraft, 4 June. Accessed 3 September 2026. Reddit
Reddit (2026b) ‘Hot foil stamping machine for chrome tanned leather’, r/Leathercraft, 21 June. Accessed 3 September 2026. Reddit
Reddit (2026c) ‘Leather Stamping Letters’, r/Leathercraft, 3 August. Accessed 3 September 2026. Reddit
Reddit (2025) ‘Large Letter Stamp and Holder’, r/Leathercraft, 15 March. Accessed 3 September 2026. Reddit
Reddit (2025) ‘Question: stamping a phrase’, r/Leathercraft, 26 April. Accessed 3 September 2026. Reddit
Reddit (2024) ‘Tips for stamping’, r/Leathercraft, 5 November. Accessed 3 September 2026. Reddit
