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This inviting set of 20 double-sided stones is ideal for counting, pattern making, number beads and sorting, among other maths concepts. These durable counters, made from a stone and resin mix, can be used both indoors and outside and in water and sand. Their tactile nature gives them a lovely feel in the hand and encourages exploration and interaction. They are ideal for use with sorting trays, to support sequencing activities and an understanding of number arrays. Stones measure 45mm dia and 10mm at the thickest point.