Featuring rotatable design, this arm rest can support 180 degrees rotation and be easily adjusted to the desired position. It is easy for you to install. This arm rest is practical, which can avoid arm suspension and provide your arm a comfortable rest place to reduce arm pressure and eliminate the muscles tension in the neck, arms and shoulders, adjust personal sitting posture to better protect eyesight. It is constructed of abs material. With folding design, it is space-saving. The length of this product is 31cm, the width is 14.5cm and the height is 7.5cm. It is suitable for most computer desks. Item Name: Computer Arm Rest Material: ABS Type: A: Basic Model (Easy To Install + Cushioned), B: Folding Model (Support 90-degree Folding Up And Down), C: Folding + Rotary Model (90-degree Folding Up And Down + 180 Degree Rotation ) Features: Punch-free, Adjustable, Quick Installation Size Details: L: 31cm/12.2", W: 14.5cm/5.71", H: 7.5cm/2.95"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Computer Arm Rest