Slev wrote on 02/03/10 at 12:06pm:2.5x3.5 is thge "standard" which began with both poker and collectable card games, most notably MtG. Various games tend to use this size as it's become the most recognised of around half-a-dozen standards. It's also very easy to buy card sleeves for.
surely it can not be hard to add a few pixels in the middle

interestingly. Taken from wikipedia
Quote:The most common sizes for playing cards are poker size (2½in × 3½in; 63 mm × 88 mm, or B8 size according to ISO 216) and bridge size (2¼in × 3½in, approx. 56 mm × 88 mm)...
I always find 2.5 in to wide personally.