S & M Tool game activities as the main props has been playing an important role. Bound in chains for products on the market are mostly from the leather or leather (fake leather) production. The price of leather high quality leather is gauche. And， whether it is made ​​of leather or leather bondage handcuffs， leg irons need to be locked (or the button)， using up more trouble， tedious process of unlocking locked， not only waste a lot of valuable time and delaying the game's passion for rhythm . For the above shortcomings， we carefully developed， chose both affordable and practical and convenient "Nylon straps" to create a new generation of instruments of restraint. PU strap material is soft yet tough， through the "Velcro" fastening paste， easy to use， closely linked to good effect. Close to the skin after bondage， beautiful and comfortable， to be able to bring a natural M safety pleasure. Because the material is soft delicate straps， so easy to fold， easy to carry and collectibles.