Gibsons vintage machine heads with pearloid buttons feature solid Nickel, closed housing construction, period-correct vintage styling, and traditional pearloid buttons that deliver precise tuning, while adding a luxurious, classic feel to your guitars headstock. This OEM part comes in a Nickel finish. 14:1 Tuning Ratio. Special note: These tuners feature screw in bushings, which require a larger diameter mounting hole than traditional push in bushing tuners.