eLink Pro Deluxe Computer Armrest Wrist Rest - Multifunctional Arm-stand Computer Support - Adjustable for Chair or Desk 180 degrees Rotatable, made of strong ABS plastic, ergonomic design for desk and chair, very easy to install Reduce Stress from cervical vertebrae, shoulder, arm and wrist; keep correct posture, avoid cervical vertebrae ache, mouse hand and nearsightedness Outstanding design now makes you move freely, comfortably and effortlessly to perform your computer tasks Unique design prevents mouse from sliding down, memory foam wrist rest protects your hand from hurt, 220mm wide mouse pad include Metal holdfast makes it much Stronger than plastic, magic strap make it easy to fast to most size of chair armrest