Graph Tech PRL-8322-B0 Ratio 3+3 Electric Guitar Locking Tuners (Black)Patented RATIO RATIO Gear Technology Calibrated tuners integrate different string gauges into the tuning equation. From low E to high E 39: 1, 24: 1, 20: 1, 35: 1, 20: 1, 12: 1. We've balanced the gear ratios for each string, simplifying the tuning process. With RATIO, a half turn is a half tone! Each string reacts the same to any tuning adjustment. Predictable and precise tuning on every string. The PRL 8311, 8322, 8331, 8341 and 8351 are right