Ratio PRB-4220CO 2X2 Y Key Chrome Bass Guitar Chrome

In order to achieve the higher gear ratio's, Ratio's are the world's first machine heads using a double envelope gear design on higher ratios and a hardened steel gear. Amazingly smooth and super strong.
One full rotation of any key results in a one full tone pitch change (give or take). From Low E to G, the gear ratio's are 36:1, 30:1, 20:1, and 18:1.