ship from Japan Designed to improve the comfort of your Magic Mouse. There will be a large indentation where you can place your finger. Widen, loosen grip and improve control. Compatible with all hand sizes (but especially recommended for average and large hands). Ambidextrous. Compatible with Magic Mouse 1 and 2. As a privilege, XL thumb grip is attached. Use it if you prefer a wider grip. High quality silicone rubber construction + 3M removable double-sided tape.