Generic 20 pcs Replacement Mouse Skates / Mice Feet For Logitech MX518 Mx500 / Mx510 / Mx700 / Mx900 ( (Dimension: 8.5mm X 5mm X0.6mm)) Replacement feet for Logitech MX518 Mx500 / Mx510 / Mx700 / Mx900 Comes with 4 sets (Dimension: 8.5mm X 5mm X0.6mm) Easy to install Reduces the friction between the mouse and mouse pad Provides a smoother gliding experience / increases tracking