This is the "HH-800" holder for 10-hole harmonicas from Tombo Musical Instruments. Product Name: TOMBO HH-800 Use: A holder for hanging a harmonica from your neck to play while strumming a guitar, etc. Features: It has a shape that is easy for many players to use and is widely used for playing and singing, etc. How to Use: Hang the holder around your neck and adjust and fix the position and angle of the harmonica with the screws on both sides. Thank you for looking.