Patented RATIO gear technology. RATIO – Calibrated machine heads incorporate different string gauges into the tuning equation. Low E to G – 48:1, 36:1, 25:1 and 23:1. 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 PRB-4401 is a right-handed set of RATIO tuned tuners for BASS that utilize an in-line 4 configuration. In order to achieve higher transmission ratios, Ratio is the world’s first machine head using a double-shell gear design with a hardened steel gear. Incredibly soft and super durable.

Specifications

• Gear ratio: unique for each string position – one tone of one turn
• Required dowel hole diameter: 0.720″ (18 mm)
• Rope post diameter: 0.547″ (13.9 mm)
• Length from string post to string hole: 0.807 in (20.5 mm)
• Weight per machine head: 3.5 oz (99.3 g)
• Weight per set of four: 14 oz (397 g)
• Rope diameter up to 130 gauge
• Includes 4 machine heads, mounting screws and bushings