Key Features :
i : This appealing set of 15 counting stones displays irregular number arrays from 1 to 5, using three different patterns of indented circles to represent each number.ii : The tactile nature of the stones means they are perfect for sensory math investigations and can be used outdoors, including in water, sand and mud.iii : The stones will help children with counting, number recognition, learning that numbers can be represented in a range of ways, subitizing, and number bonds.iv : Contains 15 stones in three shades, measuring approximately 2".v : Safe for age 2+.