A holder for notes which can be attached to your guitar head (back). Very handy. A piece of paper or cardboard (Size: A7 74x105 mm , 2.91x4.13 inch) can be put between the springs (they're built in) of the holder, so it's very easy to change the paper. It can hold multiple pieces at the same time. The holder fits any guitar head I've ever seen. You can even customize the part that is on the front of the guitar head (maybe the band name or something else)..