Jade DIY Mouse Skates – Universal 0.8mm PTFE Dots with diameter 6.5mm, offer smooth gliding. which is made of pure PTFE with One-piece molding processing, smooth and flat surface, precise fit, allowing the mouse to move more smoothly. Which is suitable for cloth mouse pads & plastic mouse pads, Not for glass mouse pads. How to install universal dots skates? please refer to the layout reference. DIY Tip:Fewer dots provide greater speed. Conversely, more dots slow down. Package Included: 40 dots skates Two alcohol Pads Two adhesive remover wipes