Ultimate Guard
Ultimate Guard is a German card accessory manufacturer whose Katana line is its best known sleeve range. Katana sleeves are published at 66 × 91 mm in standard size and 62 × 89 mm in Japanese size — the two measurements that define which cards any sleeve fits.
Katana sleeves
Katana is the range most people mean when they search for Ultimate Guard sleeves. It is sold in both of the sizes that matter, and the company publishes the dimensions on the product listings rather than leaving you to guess.
Standard size Katana sleeves are listed at 66 × 91 mm. That fits the 63.5 × 88.9 mm card used by Magic: The Gathering, Pokémon, Lorcana, One Piece, Flesh and Blood and sports cards.
Japanese size Katana sleeves are listed at 62 × 89 mm, for the smaller card used by Yu-Gi-Oh! and Cardfight!! Vanguard. Note what the manufacturer's own categorisation says here: Pokémon appears under standard size with no language qualifier, and the Japanese-size listings name only Yu-Gi-Oh! and Cardfight!! Vanguard. That is the clearest available evidence against the widespread claim that Japanese Pokémon cards need a different sleeve.
How to read the size on any Ultimate Guard product
The company labels sleeves by size category — standard or Japanese — and gives the millimetre figure. Once you know which of the two sizes your game uses, every other decision is finish, colour and price rather than fit.
This is worth stating because sleeve marketing is heavily brand-led and the underlying product is size-led. A standard Katana sleeve and a standard sleeve from any other manufacturer fit the same cards.
What this page does not do
It does not rank Ultimate Guard against other manufacturers. No independent comparative testing of sleeve durability, clarity or shuffle feel exists that would support a ranking, and a ranking invented without one is an opinion wearing a lab coat.
Where a difference is measurable — a published dimension, a stated material, a micron thickness — this site reports it. Where it is preference, it says so.
Common questions
- What size are Ultimate Guard Katana sleeves?
- Standard size Katana sleeves are listed at 66 × 91 mm, and Japanese size at 62 × 89 mm. Standard fits Magic, Pokémon, Lorcana, One Piece and sports cards; Japanese fits Yu-Gi-Oh! and Cardfight!! Vanguard.
- Do Ultimate Guard sleeves fit Pokémon cards?
- Yes — standard size, 66 × 91 mm. Ultimate Guard lists Pokémon under standard size with no language qualifier, including for Japanese-language cards.
- Are Katana sleeves the same as other standard sleeves?
- In fit, yes. Standard sleeves from any manufacturer are sized for the same 63.5 × 88.9 mm card. Differences between brands are finish, thickness and durability rather than compatibility.