Obsidian Air RAZER VIPER V3 PRO Mouse Skates - Less Noise, More Control. Obsidian Air RAZER VIPER V3 PRO Mouse Skates offer better control and stop, less noise. Which surface is hard and finely frosted texture, effectively increasing the friction of the surface, especially hardened PTFE increases the braking power of the skates, allowing better control and emergency stop. Which is suitable for cloth mouse pads & glass mouse pads, not for Coating or plastic mouse pads. Comparison of sliding speed: Obsidian>Obsidian Air>Obsidian Pro>Obsidian Pro Air (measured on AC PRO MID) Package Included: 2 sets skates Two alcohol Pads Two adhesive remover wipes