Gold metal humbucker cover - closed / no pole piece holes. We recommend that you have the cover wax-potted onto the pick-up. This will eliminate microphonic feedback which can affect pick-ups that don't have this process. It is not something that can be carried out by anyone and we strongly advise that you have it professionally done. For a quote on wax potting, speak to Aaron Armstrong on 01233 732979 or e-mail him at aaron@armstrongpickups.co.uk