Because not all hands are the same size!
Contour Mouse is a family of ergonomically designed mice that support any and every hand, no matter the size. Therefore, your grip on the mouse is relaxed, and you avoid bending your fingers too much.
The Contour Mouse family consists of multiple mice in different sizes both for the right and left hand, and with the possibility of a wired or wireless connection.
Designed with three equally big mouse buttons
This ergonomic mouse has five buttons, including a third, full-size middle button. The three primary buttons are extra long, so you can click using your knuckles rather than your fingertips. The fingers rest on the buttons, and you click using small, soft movements with outstretched fingers. Your thumb rests between the forward/back button and the scroll wheel on the side of the mouse.