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2 sets of 1-10 stones, Each stone measures between 80-85mm in length., This robust set of counting stones displays number arrays from 1 to 10 using a pattern of indented circles to represent the relevant number. Made from a stone and resin mix, these stones can be used across a variety of environments including water and sand. Their tactile nature means that they are perfect for sensory maths investigations. Contains 20 Stones (2 sets of 1-10 stones)