This invitingly smooth set of 20 double-sided stones is ideal for counting, pattern making, number bonds, and sorting, among other maths concepts. These durable counters are made from a stone and resin mix and can be used outside, in water, and in sand. Their tactile nature encourages exploration, interaction and open-ended play. They are ideal for use with our 10-Frame Tray, which supports sequencing activities and an understanding of number arrays. Set contains 20 two-tone stones measuring 45mm in diameter and 10mm at the thickest point. Age 2+.