Guitar ​thumb rest, Bass thumbrest is. A good replacement part for or old-one. smooth cushion, provides extras thumb rest and for your hands and the instrument. With mounting screws. It is and fits for your guitar and bass. Help to maintain the correct finger position. Reduce the strength required to play the instrument, relieve repetitive strain injury, help to alleviate the fatigue of long-term instrument playing. Great accessory for guitar and bass instrument. You can freely set this part on the bass you want.