SteelSeries exclusive tactile alerts allow you to feel in-game events, the fastest and most ergonomic button layout available is built around your thumb, and the 16,000 CPI custom PixArt sensor provides incredibly precise control. reinforced mouse buttons on the left and right with 30 million click switches, the most in the industry. 15 programmable fast-click buttons that allow for complete customization; Grip Types: Fingertip, Claw, and Palm