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Can be used in sand, water and small-world play. Durable and weatherproof for outdoor use. Cast from a resin and stone mix, each pebble is engraved with a number and measures between 30-45mm. Includes: 2 each of Numbers 0-20 and Plus, Minus & Equals Symbols; 1 each of Times & Divide Symbols and a Leaflet of Ideas & Activities.