The Large DynaBoulder™ Climber by Pierceton Rubber is made of 100% recycled tire rubber. It's environmentally sound structure is ideal for school playgrounds, parks or any area where children might climb or roughhouse. The DynaBoulders™ are very durable and will last for years! Each DynaBoulder™ comes carefully packaged and although it is not necessary to anchor the boulders due to weight, each comes with an anchoring system. If your local school district or park and rec department need more than one rubber boulder set, please call for quote. Due to the weight on each boulder set/ products, shipping charges are assigned per each when purchased per the online shopping cart.  See other cool climbers by Pierceton Rubber.