Tune to perfection. The Gotoh SD90-SL Tuners Set of 6 won't just make your guitar look super classy. It'll also help to keep your tuning tight and stable, so you can focus on what matters most: playing music. Made from superb components by world class hardware specialists Gotoh, you can be sure that the premium performance of these tuners is guaranteed. Simply install them on your headstock and away you go.