●Improves Balance Ability: Balance stones are playground equipment inspired by moving stones in the river. Through this play, you can improve your balance and strengthen your core. Improve your motor skills ●Anti-slip Design: The bottom of the balance stone is made of silicone material, so it is non-slip when children use it. Even more, the bumpy surface ensures maximum safety of children ●Lightweight Design: The balance stone has an empty interior and is lightweight. Easy to carry anywhere. Can be used indoors or outdoors, in kindergarten or in childrens rooms ●[Specifications] Product Weight: Approx. 13.3 lbs (6 kg); Load Capacity: Approx. 220.5 lbs (1 ●Size and Color Details: Set of 5: Diameter 13.0 inches (33 cm) x 1 orange, diameter 12.0 inches (30.5 cm) x 1 blue, diameter 11.2 inches (28.5 cm) x 1 piece x green, diameter 9.4 inches (24 cm) x 1 piece x yellow, diameter 7.1 x red