Do covers affect the tone of a pickup?
The type of metal cover you choose can have a significant affect on the sound of your pickup. Generally metal covers will knock some of the highs off, making the pickup sound warmer or darker, while plastic covers will have no effect at all. It is generally found that the most magnetically transparent metal cover available is high quality nickel silver.
All of the metal covers available at Mojotone are made from pure nickel silver, with the only exception being the plating. The cover itself is nickel silver but the plating is ferromagnetic and will have a slight affect, as it acts as a very thin magnetic shield.