These durable two-colour counters and specially designed tray will help children develop an early understanding of sorting counting number bonds to 10 addition and subtraction in a highly visual and tactile way. Set includes: 10 frame tray made from sustainably sourced natural beech wood dimensions: 380 x 155 x 20mm and 20 double sided stones made from a unique stone mix dimensions: 45mm in diameter and 10mm at the thickest point.