The Grover Sta-Tite U99-18 series ukulele tuning machines provide precision tuning for your ukulele. With an 18:1 gear ratio, you'll achieve accurate tuning and stable intonation. The open gears are beautifully designed, and the ebony buttons add a classic look to complement your ukulele's aesthetics. The 21 mm posts securely mount to your ukulele's headstock while the 0.9 oz weight per machine head ensure balanced tension across the strings. Whether you're performing on stage or practicing at home, Grover Sta-Tite ukulele tuning machines will keep your uke in tune through intense playing sessions. For ukulele players seeking pro-level performance and styling, look no further than these tuning machines.