Graph Tech Ratio Tuned Machine Heads is a set of three a side acoustic guitar tuners. They have a contemporary shaped button and two pin casing. Ratio Tuned Machine Heads are the first and only machine head to incorporate the different string gauges into the tuning equation. Graph Tech balanced the individual gear ratios to each string dramatically simplifying the tuning process.
No more overshooting the G string or twisting away on the high E string. With Ratio, each half key turn equals one semitone change on all strings! Quicker, more accurate tuning on every string. Now includes InvisoMatch Standard Mounting Plates for easy installation. Fits most headstocks.