SHANAYA cushion pad is made of ABS and silicone. Padded memory foam is incredibly pleasant, strong, and soft and firmly adheres to the surface. 1.Fix the clamp &Tight the Screw. 2.Fasten the board on clamp. 3.Installation finished. 4.Comfortably use. You can put this PC arm rest through its paces. Though you are not need to utilize this. Just position this parallel to the table to avoid taking up any space. appear neat and highly practical. Relax your wrists and neck while you work and enjoy some amusement. Relieve your aches and weariness. effectively aid in promoting blood circulation. Ideal for lengthy office hours, computer desktops, keyboard pads, sleeping pads for lying down, daily use at home, and amusement on office tables, among other uses. Always give your elbow and wrist gentle, warm touches.