Boston classic guitar soundhole mute 85mm diameter AGM-85

Boston classic guitar soundhole mute 85mm diameter 

The Boston AGM-85 is designed for classic guitars with a pickup.
When you go on stage with your (classical) guitar you often get annoying feedback and then the AGM-85 comes in handy.
It is easy to assemble and remove and fits into any classic guitar soundhole with a diameter of 85mm.