Jenni Bowlin Studio Mini Bingo ATC Cards - Book Covers - a book covering style ATC set. This is an amazing new ATC set! Each package includes 6 heavyweight cream book cover cards measuring 2 1/2 in. x 3 1/2 in. 1 each of 6 different detailed book covers per set. Use yours as ATCs, altered ATC books, greeting cards, scrapbook page accents or whatever your creative self can dream up!