This set is ideal for teaching a range of mathematical concepts in early childhood including addition, subtraction, number bonds and ten frame work. The bases can be placed side by side, under each other or stacked using the counters (3.3cm diameter). All the pieces are made from FSC® Certified Beech Wood. Each of the 40 counters are chunky and ideal for little hands. Each set contains 27 bases which include a 1 hole, 2 hole, 3 hole, 4 hole and 5 hole base size (5 hole base measures 24cm long). Age: 2+.