This is a genuine Ovation acoustic guitar option part: a feedback prevention cap. Although it's quite old, it's almost unused, and I believe the elasticity and texture of the rubber are still perfectly functional. As many of you know, plugging the unique soundhole of an Ovation guitar with these caps helps prevent feedback when using it as an electric-acoustic guitar. Furthermore, by strategically placing these 22 caps, you can also eliminate unwanted frequencies. Please understand that these are old parts and accept the transaction on a no-claims, no-returns basis.