Guitar picks are used to prevent scratches and protect the guitar body. The back is shielded with aluminum foil, not the common aluminum foil on the market. It has good shielding performance and anti-interference.Detailed Description:Black Pearl Color.Fits for St style electric guitar. If you use it for Strat other style guitar, you may need a modification for line up.Note: Item's color might be different from the picture because of the aberration.Package Includes:1 x guitar backplate25 x mounting screwsBefore ordering a product, please check the size chart to confirm that it fits your guitar.