Graph Tech PRB-6330-B0 Ratio Bass Machine Heads with Y-Style Button - 6-String, 3 + 3 - 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: B - 48:1, E - 36:1, A - 30:1, D - 20:1, G - 18:1, C - 16:1, 6 pieces: 3x left, 3x 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
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