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.