Zeny 38'' Mini Band Fitness Trampoline Safe Elastic Exercise Workout w/ Padding & Springs (Mini 38" Trampoline) Safe elastic band technology replaces conventional metal springs Woven polypropylene jump mat is the same material used on full-size trampolines Padded skirt covers the elastic bands and outer edge of frame Excellent for cardio fitness while being a low impact exercise designed to be easy on the joints Simple, rugged design with proven band technology for years of safe use