Children love climbing on rocks, which is a nightmare for most parents. Rocks can be slippery, covered in moss, home to hiding snakes and they often have some really sharp edges. This Set of Three DynaBoulders by Pierceton allows children to play on rocks while putting parents and guardians at ease. Recycled rubber has been used to create these pieces. This supplies a soft surface for sitting, stepping and climbing. In this set, you receive a total of three boulders in various size, including small, medium and large. Choose from an array of colors and shapes to accommodate your exact needs. Total weight of all three pieces is over 900 pounds, just to give you an idea of how sturdy they are. They are made for commercial use to meet CPSC guidelines.