Skywalker Sports Hanging Bridge Accessory Module Although not required by law, all Skywalker Trampolines products are thoroughly tested for safety and durability, and are found to meet or exceed all standards put forth by the American Society for Testing and Materials (ASTM). Weather and rust resistant powder-coated steel frame construction Requires the Skywalker Sports Modular Jungle Gym (SJG200) for assembly (available separately)