Thank you very much for viewing. This is a "Treble Bezel for Rickenbacker 4001/4003". By replacing the rear pickup cover of the Rickenbacker 4001 and 4003, it becomes a finger rest without any modification to the body. In addition, it gives a neat impression around the bobbin. Furthermore, the absence of a cover on the top of the pickup makes it easy to adjust the pole pieces. It is made of carefully processed ABS resin. Fits 4003 and 4001 models from the 70s onwards. It may also fit other Rickenbacker models that have the same pickup cover shape as the 4003 and 4001. For Greco and Fernandes, the PU frame of this product needs to be filed down. *Please search the internet for installation methods and adjustments. Please purchase only if you agree to no claims and no returns.