It is made of thickened & strengthened fabric with an anti-slip rubber layer. The most powerful exercising tool for women or men! You can do a lot of exercises with these workout bands, Pilates, Squats, Lunges, Glute Bridge, Donkey Kicks, Monster Walk etc. These bands exercise your glutes, thighs, legs, abs, and shape your perfect curvy butt. This price included shipping cost to ca. QTY over 500Pcs via sea. Thanks for your inquiry.