Using a harmonica holder leaves your hands free to play a guitar or other musical instrument at the same time as a harmonica. The 154 harmonica holder is designed for use with most 10-hole model harmonicas, making it smaller and lighter weight than some other models, but it still offers a rubberized neck Brace and sturdy frame. A single wing nut is used to lock it in playing position-throww in your harp and you're ready to go. One size fits all, and the device easily locks in place at any distance from your mouth.