MARVO FIT GRIP is one of seven interchangeable mouse cases for Marvo Fit Lite and Fit Pro series mice. The design of both Marvo Fit series mice allows for quick, tool-less replacement of the housing. The entire replacement process takes just ten seconds and involves only removing the side buttons on the mouse, replacing the casing and reinserting the buttons. The housings are precision-engineered to fit the mouse perfectly. The housings ensure that the mouse is guided precisely on the mouse pad or on the desktop. In each set you receive a case in two sizes: small and large.