Measuring between approximately 2.5-3'', Jumbo Number Pebbles are perfect for little hands. Made from a unique stone mix, each pebble is engraved and painted with a number. Children will enjoy collecting, sorting and transporting the stones, learning important early math concepts at the same time. Highly durable and ideal for learning through play outdoors, the set includes 22 pebbles - two each of numbers 0-10.