Hippus XS2WB Wired Light Click HandShoe Mouse (Right Hand, Extra Small, Black) Provides full support of the hand and wrist. The shape allows for the hand to continuously rest on the mouse body in a relaxed fashion and thereby reducing the risk of RSI (repetitive strain injury). X-Small = 6 " or Smaller BlueRay Track technology makes it work on almost every surface without a mouse mat. Color: black