Hotline Gaming compatible Mouse Skates / feet for the Logitech G400 / MX518 / G400s 1.Helps Protect Your Original Feet From 100% Original Hotline Games Product. 2.Smooth Glide Ensured From 100% Original Hotline Games Product. 3.PTFE Teflon. (erformance - Made with PTFE Teflon with 3M Adhesive) 4.Competition - New proprietary F4 Silver Treated PTFE to provide a glide smoother than ordinary PTFE, glide feels smoother, and will last for a longer time 5.Be sure to check out original mouse feet from Tiger Gaming as well, same factory as Razer, better cutting, thicker, slightly smoother glide in my opinion, and great value.