This set includes 20 colorful pebbles with 5 different patterns. Children can use them to count, sort, sequence and stack. These chunky pebbles are ideal for early math activities and loose parts play. And they're perfect for small hands. Made from durable rubberwood and non-toxic paint, these pebble-shaped pieces are designed for years of use. For ages 1+. Sizes: 1.8"L x 1.6"W x 0.4"H - 3.4"L x 3"W x 0.4"H