Description: Designed for both office desks and chairs Mounting, the clamp can be attached to desk surfaces (up to 2” in thickness), 3 straps secure the platform to chair arms Putting your hands on it can reduce the pressure on your arms and wrists, relieves arm fatigue and eliminates the constant strain on muscles in the neck, arms and shoulders 180 Degree Rotating Design, Find just the right angle for your armrest, lets you move freely and effortlessly throughout the day. The surface is made of high-quality leather pad and memory sponge filling, feels very comfortable, wear-resistant and soft, never loses shape Ergonomic designes for comfortable and long time use, easy and simple to install Specification: Color: Black Material: ABS Plastic Length: 45cm/17.7 inch Width: 18CM-12.8CM/7.1-5.0 inch Desktop Thickness for Clamp: No more than 5cm/2.0 inch Package Includes: 1x Arm Rest Mouse Pad 1x Clamp (2 Pack) Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you