Features: The product not only won'for t scratch mouse pad, but also makes the movement of the mouse smoother and more stable to the Rounded Edges mouse skates of other makers. The material of the product adds lubricating on the base of PTFE. Achieve precise and comfortable operation on different materials mouse pads such as cloth or nylon. Reduces the friction between the mouse and mouse pad.Provides a smoother gliding experience. All the useless scraps mouse skates are pre-removed for easier use. Strictly designed according to real mouses,after consider the mouse sensor's durability and accuracy carefully,the shape, the thickness has been adjusted for every model. Specifications: for: for RAZER VIPER Ultimate Mouse Arc edge design Color: White thickness:appprox. 0.8mm Material: PTFE Size:appprox. 9x7cm/3.54x2.76in Quantity: 2set /pack Note: This product is a replacement mouse feet. After removing the original mouse foot sticker, clean the bottom for shell by the alcohol cotton which is attached in the package, and then paste the new mouse feet on. After removing the transparent protective film on the mouse feet, carefully align the feet groove on the mouse bottom for shell, then apply slight pressure to fit the foot. Do not repeatedly stick and peel off the foot stickers. Package includes: 1 Pack x Mouse Skate for RAZER VIPER Ultimate Mouse(2Set)