A little side project designed to make Magic Mouse more comfortable. Creates big concave surfaces to place your fingers. Widens & relaxes your grip. Gives you better control. For all hand sizes (but especially great for medium & large hands). Ambidextrous. Fit's Magic Mouse 1 & 2. A bonus XL thumb grip is included for an even wider grip, if you prefer. Premium silicone rubber construction + removable 3M adhesive.