Tune faster and with deadly accuracy!

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UNLOCK THE TRUE POTENTIAL OF YOUR GUITAR

World's Only Calibrated Machine Heads for Electric, Acoustic and Bass.  

TUNE FASTER & WITH DEADLY ACCURACY

Quick, easy installation  / Satisfaction Guaranteed!

RATIO’s patented gear technology- custom calibrated gears for each string... fine tuning where you need it. Every string has the same smooth feel and response.

RATIO ELECTRIC GUITAR LOCKING & UNLOCKING MACHINE HEADS

*Available on 6 and 7 string

RATIO ACOUSTIC GUITAR LOCKING & UNLOCKING MACHINE HEADS

*Available on 6 and 7 string

RATIO BASS MACHINE HEADS

*Available on 4, 5 and 6 string