Gotoh Res-O-Lite GB350 Chrome Enclosed Bass Machine Head Set (4-in-a-line) Mounting hardware included. These compact bass machine heads with threaded bushings for 9/16'' diameter peg holes. Gotoh's "Res-O-Lite" machine heads are extremely light weight, only 40 grams each, and made from aluminum alloy to make for a less heavy necked bass. Superior quality and precision made for even the most demanding players out there! Comes in 4 on a side and features a 20:1 Gear Ratio