The open backs are a right handed set of open back Ratio Calibrated Machine Heads for Acoustic guitars that use three per side tuners. Classic skeleton button.
A right handed set of Ratio Tuned Machine Heads for acoustic guitar that use three per side tuners. It has a two pin casing that can be used as is, or with Graphtech's InvisoMatch mounting plates.
THE SIMPLE GENIUS BEHIND RATIO® SYNCHRONIZED MACHINE HEADS
Graphtech has tuned the gear ratios to each string position so that every string responds the same to any tuning adjustment. You get fine tuning on the thicker core strings and coarser tuning on the thinner core; anywhere from 12:1 to 39:1 gear ratio. With Ratio®, one turn is about one tone change on all strings, making tuning, retuning and open tunings easier, quicker and more intuitive.
PREDICTABLE, PRECISE TUNING, RETUNING AND OPEN TUNINGS.
Ratio® tuning feels natural. You don't have to think about which string you are tuning because they all feel and respond the same. No more overshooting the Low E or plain G. No more twisting away on the High E or D string. Open tunings have never been easier. String gauges such as light top, heavy bottom are no problem with Ratio®; they still do the same precision tuning..
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