Up for sale is an old mouse holder from the side of an old CRT monitor from the 1990s. This would have been attached to the side of your monitor with the hook and loop or sticky back tape. It measures about 3" wide, by about 4 1/8" tall, by about 1 5/16" deep. The last picture shows an old mouse in the holder - it has a slot in the bottom for the mouse cable to fit. The old mouse is NOT included - just in the picture to show how an old mouse fits into the holder.