Rainbow River Stones - Set of 6Three different sizes of stones enable children to create their own routes, including stacking stones on one another, or combine with the Wavy Tactile Path (above) for even more sensory route combinations. Children will increase their balance and movement coordination while being active. Ages 3+. Dimensions Stones range in size from 28 cm (11") D to 40 cm (15 3 4") D, and from 9 cm (3 1 2") H to 13 cm (5") H, individually.