If you need arm support, you should choose the RollerMouse Red Max, which provides full support for both your hands and arms. RollerMouse Red Max is a premium ergonomic center-aligned mouse made of aluminum, featuring a wide grooved roller bar and scroll wheel for better control.RollerMouse Red Max is adapted for all the functions you can use on a computer today, and for all sizes of screens. The roller bar is placed in front of the body, ensuring mouse work with minimal stretching, and the centered working position protects against back, neck, and shoulder pain throughout the day. The built-in copy/paste buttons make it easy to quickly transfer text or images between programs, or set the programmable buttons to your preferred shortcut functions.