Cast from a resin and stone mix, they are durable for use in sand, water and small-world play. Each pebble is engraved and measures between 3-4.5cm. Number set includes two of numbers 0-10 (22 pebbles). Sum building set contains both number and operation pebbles, a playful way for children to explore sums. Includes two each of numbers 0 - 20, +, -, = and one each of x and ÷.For ages 3yrs+.
The items were as expected and the children are really enjoying playing with them.