Comment: Hi Cathy, You did a wonderful job on your first swap. An ATC is 2 1/2 x 3 1/2 inches. You can buy blank ATC cards but they are very expensive. Most of us use cardstock or cardboard (a lot of people use cereal boxes or tissue boxes). You can cut 10 ATCs out of an 8 1/2 by 11 sheet of cardstock. Don't forget to put you name, swapbot name, date, and name of the swap on the back of the card. Let me know if you have any other questions! Marjorie