1Adorned with artist and author Eric Carle's illustrations from the book 1, 2, 3 to the Zoo, these beautiful flash cards feature three great subjects for infants and toddlers: animals, trains, and counting Printed on thick, sturdy board, they are equally suited for small hands to hold, hanging on the wall in a child's room, or making a number frieze in a classroom. The set of 20 cards counts from 1 to 10 twice.