Graph Tech PRB-4220-B0 Ratio Bass
Graph Tech PRB-4220-B0 Ratio Bass Machine Heads with Y-Style Button - 4-String, 2 + 2 - Black, Graph Tech Ratio machine heads for bass, closed construction, each machine head has its own gear ratio, calibrated for the respective string, one full rotation of any key results in a one full tone pitch change (+ / -), ratio: E - 36:1, A - 30:1, D - 20:1, G - 18:1, 4 pieces: 2x left, 2x right, axis diameter without mounting sleeve: 8.9 mm (0.350""), mounting diameter with mounting sleeve: 14.3 mm (0.563""), weight ca. 52.62 g / 0.116 lbs (single), Y-Style Contemporary button, black finish