This new version of the River Stones features a soft base and a hard-top platform supported by three strong steel springs to enable bouncing. Stepping and jumping on the Bouncing River Stone is more physically challenging as bouncing requires adjustment through the ankles and legs, which strengthens the proprioceptive sense. The Bouncing River Stones can be used on its own for special motor training activities or together with Hilltops Steeping Stones to provide even more play possibilities. From 2 years. 110lbs limit.