The product not only won'for t scratch mouse pad, but also makes of the mouse smoother and more stable to the Rounded Edges mouse skates of other makers. The of the product base of PTFE. Achieve precise and comfortable on different materials mouse such as cloth or nylon. Reduces the friction between the mouse and mouse pad.Provides a smoother gliding . All the useless scraps mouse skates are pre-removed for easier use. Strictly designed according to real mouses,after consider the mouse 's durability and accuracy carefully,the shape, the thickness has adjusted for every model.