Give your nylon string guitar a modern twist with the sleek Silver Cordoba tuning machines. This set comes with the black ebony-style buttons already installed and mounting screws. Gear ratio is 14:1. The string roller spacing is 35mm. As seen on the Cordoba Fusion series guitars. (Treble side pictured) *The terms “treble” and “bass” refer to right handed models. For a “bass” side on a left handed model, choose “treble”, and vice versa.