Rebound Air Non-Folding Trampoline AIR, Inc. is a manufacturer of high quality rebounders. Their goal is to make the best rebounder on the market. Why rebound to begin with? Here's why: Full Aerobic, Cardiovascular, and Strength Workout Improved Balance, Coordination Improved Muscle Tone Significantly Less Shock (Trauma) To Joints Than Jogging Increased G Force Creates A Better Workout Can Be Use By Injured, Disabled, and Elderly Excellent For Rehabilitation Convenient Great Starting Point For The Sedentary Improved Circulation and Immune Function Recommended By Trainers, Chiropractors, Doctors, and Physical Therapists Works Well With Existing Exercise Equipment For A More Complete Workout Large Varieties of Exercise Routines For All Levels 300 Pound Weight Capacity Only available in black 36 Springs, 40$f_enc Diameter, 33lbs. Five Year Warranty on Frame and One Year on all other Parts The rebounder has been around for years. However, never before has it been manufactured with such stringent specifications. You would think that by making a rebounder as compact as these, sturdiness would suffer. Not true. The quarter fold is able to stand up to the same punishment as any non-folding units.