PATENTED DESIGN: Compatible with XB1 / XB1 Slim / X1X / XSX Controllers and Elite Controllers. PROTECTION: Protect the original joystick from wear and tear. (NOT REPLACEMENT!) ACCURACY: Increase accuracy through extra height and active radius. MORE GRIP: Made from a special "grippy" material that increases friction and provides more sensitivity to enhance your gaming experience. 3 pairs of thumb grips that have completely different designs to meet gamers’ needs.