The RollerMouse Red Arm Support is an originally integrated accessory for the RollerMouse Red that provides full support for both hands and arms, so arms and shoulders can maintain a more neutral and relaxed position. During long workdays, you can work relaxed and pain-free thanks to this support. The Arm Support Red is easily mounted on desks with an edge of 2.54 - 5cm and is perfect for sit-stand desks.