Simple, rugged design with proven band technology for years of safe use. The safe elastic band technology replaces noisy metal springs and makes assembly even easier. Durable woven polyproylene jumping mat with padded cover for elastic bands and outer frame. The steel frame is designed with removable legs that unscrew without tools for easy storage. Excellent for cardio fitness while being a low impact exercise designed to be easy on joints. It"s fun for all ages and supports users up to 200 pounds.