Thank you for viewing. This is a thumb rest that came with a Flasell Mark 6 tenor saxophone (serial number 210,000s). I no longer need it because I replaced it with a metal one. There is a scratch on the round part in the photo. I bought the instrument used, so it's unclear whether the scratch was made by the previous user or when I replaced it with the metal one. For those who understand that this is a used item.