Gonge Riverstones Go to amazon.com Related posts Top gorilla gym Top 9 best crash pad FeatureGreat for improving coordination and balanceEach side of the stones vary in steepness and difficultyMay be stacked for easy storageRubber rim prevents slippingContians 3 large stones and 3 small stones DescriptionAmerican Educational 1137385 River Stones (SET)