Modulus Res-O-Lite Tuning Key - Chrome
One of the easiest ways to lighten your bass is to shave some weight off at the headstock.  Weighing 1.36 ounces each, the Modulus Gotoh Res-O-Lite is lightest tuning key we have ever offered. 

Gear Ratio = 20:1
Weight: 1.36 oz. each (38.55 grams)