It is Made of TPR material, designed with an 8 shape, perfectly fits your hands and body, which is ergonomic and makes it more comfortable to use, help to relieves stressed hand and reduce frictional injuries. Arms, back, shoulders, legs and hips are exercised at once with an active band, ideal for body stretching, resistance training, yoga and physical therapy, helping to strengthen torn ligaments or muscles. If you have any ideas for customization, please do not hesitate to contact us!