Features: A. surface curved design, feel more comfortable B. Use advanced slow rebound memory cotton to support the wrist, keep it at a comfortable height C. There are four stainless steel balls at the bottom, free to move 360 on the desktop or mouse pad D. Ball design, to avoid the wrist in the surrounding movement with the desktop friction, reduce the wrist fatigue and injury E. The product can improve work efficiency, reduce pain and computer-related injuries F. ergonomic design, better protect the wrist and the palm of the key health Description: Material: ABS + memory cotton + steel ball. Size: 120 x110x27mm(4.7x4.3x1.1inch) Color:Black Package Contains: 1xMouse Pad Note: Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Included:(Without retail package) 1 x Mouse wrist rest pad