RATIO® patented gear technologyRATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation., From Low E to High E
3+3 RATIO Acoustic Guitar Machine Heads GT-118-D01
RATIO 3x3 Acoustic Open Back Guitar Tuners PRN-3411
Graph Tech PRN-3411-N0 Ratio Acoustic 3+3 Open Back Tuning Machines - Skeleton Button / Nickel Finish
3+3 RATIO Acoustic Guitar Machine Heads GT-118-D01
Graph Tech Acoustic 3+3 Skeleton Button Nickel : Musical Instruments
3+3 Ratio Acoustic Open Back Tuners (PRN-3411, Select Finish) - Nickel / Skeleton
RATIO 3x3 Acoustic Open Back Guitar Tuners PRN-3411
Graph Tech PRN-4324-N0 Ratio 3 + 3 Waffle-Back vintage Fender Style Machine Heads Nickel
3+3 Ratio Acoustic Guitar Machine Heads PRN-3422 | Graph Tech