Specification:Material: PVC/Stainless Steel/FoamColor: Clear Wheel diameter: 7.8inHandle total length: 3.9inWheel spacing:0.98inProduct Length: 9inPackage dimensions:Product Weight：Max Load capacity: 440 lbs Package Include: 1 x abdominal roller wheel1 x knee pad mat2 x resistance bands Our Advantage:Super quiteSoft spongeStable and safeNon-slip textureWear resistanceSuper load-bearing Applicable Scene: Fitness, massage, slim, sports, dance, etc. You can use the device to train your muscles in the shoulders, arms and back. Tips:-Warm up for at least 5 minutes before the first workout so as not to overload the muscles.-Pay attention to your breathing during the exercises. -Remember to do some stretching and relaxation exercises after your workout. Customer Satisfaction:30 days refund, 1 Year Warranty and friendly after-sale service. Please contact us if you have any questions.