Appealing to children’s natural instincts to sort and collect, these durable and tactile pebbles can be used in sand and water both inside and outdoors. Each pebble is cast from a special stone and resin mix and engraved and hand painted with a numeral making then highly appealing. Perfect to encourage children’s fascination with numbers. Includes two of numbers 0–20, two of operations +, – and =, and one of operations x and ÷. Ages 2+