■ I used this for about two weeks, but it didn't suit me, so I'm selling it. I was using it for a Logitech trackball. This is a tilt-adjustable disc pad for trackball mice that reduces strain on your hands and wrists by adjusting the tilt to match your posture. You can adjust the tilt angle to your liking by rotating the pad forward, backward, left, and right. The edges of the pad, which are likely to come into contact with the wrist during use, are beveled to reduce wrist strain and support long hours of operation. The pad surface and bottom are treated with non-slip silicone to provide stable operation. This product is part of an effort to reduce waste, and the instruction manual is paperless. #Trackball