Upgrade your guitar with a new set of Cordoba Master Series tuning machines, used on each Cordoba Master Series guitar. These tuning machines feature a brushed bronze baseplate, gold plated steel worm shafts, nylon string rollers, and come with ebony style nylon buttons. The gear ratio is 18:1. The string roller spacing is 35mm. *The terms “treble” and “bass” refer to right handed models. For a “bass” side on a left handed model, choose “treble”, and vice versa.