The 16-pin Connector Jack Plates are made of Aluminum. They are a direct replacement for Synth-Linx and Roland/BOSS 13-pin GK jack plates. In addition, you can specify the orientation of the connector to be either vertical or horizontal, which is useful when using a right angle jack plug on the guitar. Rectangular plates are available in standard or large sizes, the latter being useful for situations where the original screw holes are stripped. Plate model numbers with "B" indicate that they are black. In addition plate models ending with "C" indicate that they are curved to match the guitar body shape.