Made of durable ABS & Plastic, padded memory foam tightly attaches to the surface, minimizes wrist and shoulder strain. No assembly needed! It can be easily rotated out of the way and be carried in a briefcase or computer bag. Fully adjustable 180° ball joint is adaptable for left or right hand users, effectively contribute to promote the blood circulation. Suitable for desktop up to 2'' (5cm) thick, convenient for home or office use.Play and work comfortably for hours. The computer armrest reduces localized pressure on wrist and eliminates the constant strain on muscles in the neck, arms and shoulders.