RATIO patented gear technology.RATIO - Calibrated Machine Heads incorporate different string gauges into the tuning equation.From Low E to G - 48:1, 36:1, 25:1, and 23:1.We balanced the gear ratios to each string simplifying the tuning process.With RATIO®, a half-turn is a semi-tone!Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string. The PRB-4401 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 4-in-line configuration.In order to achieve higher gear ratios, Ratio are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.
Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 0.720" (18mm)String post diameter: 0.547" (13.9mm)String post length to string hole: 0.807” (20.5mm)Weight per single machine head: 3.5oz (99.3g)Weight per set of four: 14oz (397g)String diameter up to 130 gaugeIncludes 4 machine heads, mounting screws and bushings