4 years & up. Inspired by stepping stones in a river, each side of the triangle varies in steepness and difficulty. Jump from stone to stone without touching the floor. Alter the position of the stones to create more challenging paths. Each stone has rubber studs on the base, which prevents slippage, and protects indoor floors. Provides challenging, active, imaginative fun. Enhances confidence, ability to judge distances, develop coordination and balance. Stones stack easily for storage. Weight capacity 110 lbs. Each set includes 3 big stones. 2" W x 3" H and 3 small stones 10" W x 2" H. Each set includes 1 of each color: Blue, Green, Orange, Purple, Red and Yellow. Activity guide included.