Jade Air DIY Mouse Skates – Less Noise, Smooth Control, Stable Braking Universal 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. Now New upgrade the Noise and Vibration Reduction Tech! Which is suitable for cloth mouse pads & plastic mouse pads. Comparison of sliding speed: Jade>Jade Air>Obsidian>Obsidian Air>Obsidian Pro>Obsidian Pro Air(measured on AC PRO MID) 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