... sticky cloth, sponge and plastic.sport Knee support (fixation belt of thigh and fixation belt of shank ),adjustable knee hinge, gluing and plastic ring.PropertiesTourmaline lumbar ... support Technical requirements:Suture firmly, smooth surface, flat, elastic fabric line, Stitch evenly, straight edge, uniformly around the symmetry. Tourmaline magnetic lumbar/waist/back Support belt ...