Gotoh Res-O-Lite GB350 Enclosed Bass Machine Head Set (2 per side) 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 2+2 configuration and features a 20:1 Gear Ratio Mounting hardware included.