Features: brand new and high quality Replace your old mouse feet for that for extra to increase your performance in game. High Quality Highly recommended Having characteristics of non-adhesive, high smoothness and high wear-resistance. Decrease the friction between the mouse and the mouse pad caused by the movement, reach the effect of maintenance. It will greatly increase the smoothness between the mouse and the mouse pad after using, allow you to experience the feeling of freely flying. The work of mouse skates is so deliberate and carefully especially filing up the edge of chamfering that it can avoid accident scuffing for mouse skates effectively. Entire series of glue line is manufactured by Hotline Games own production. Once it is used out after sticking on the mouse for a long for time, it still can be detached completely without defective gum. Competition-- New proprietary F4 Silver Treated PTFE to provide a smoother than ordinary PTFE, feels smoother, and will last for a longer for time Specifications: Type: for Hotline Sports 4.0 Fit for: for RAZER Viper Ultimate Wireless Mouse Material: PTFE Adhesive for 3M Design: Rounded Curved Edge Color: White Material: PTFE Thickness: approx 0.21mm Size:appprox. 16x11cm/6.3x4.33in Quantity: 1 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 Feet