Gotoh 35G18002WSB Classical Machine Heads Set of 3 + 3Gotoh Classical Guitar Machine Heads are solid brass with an elegant engraved motif. They feature a white colored plastic button. Extremely good value, high quality, and durable. Comes with mounting screws. This is a complete set of 6 machine heads configured 3+3 Features ROCK SOLID posts prevent the rocking or rattling of string post Shaft length 30 mm Shaft diameter 10 mm Gear ratio 1: 14