Topps and Panini cards typically measure 6.4 cm by 8.9 cm, or 2.5 inches wide by 3.5 inches high. Each card weighs about 1.5 grams and is about 0.013 inches thick, which is equivalent to 13 points.
You can find drill bits with imperial and metric units printed on them, but what about letters? Here's what an A (or B and so ...