Graphtech Ratio Tune-A-Lele Ukulele Tuners (4 pcs) PRU-4004-BK 

RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

Tune-a-Lele Ukulele tuners are the worlds lightest machine heads, with a uke friendly 6:1 gear ratio!

This super light, yet strong machine head makes ukes balanced, not headstock heavy, and with zero back lash makes tuning so much easier.

The PRU-4004-BK is a set of RATIO® Machine Heads for ukulele that use 4 tuners.

These ukulele machine heads are perfect fit for all types of ukuleles including Soprano type.

Gear ratio: 6:1
Peg holes diameter required: 0.236" (6mm)
String post diameter: 0.232" (5.9mm)

Bushings diameter: 0.344" (8.75mm)
String post length to string hole: 0.732” (18.6mm)
Weight per single machine head: 0.011lbs (5g)
Weight per set of six: 0.044lbs (20g)
String diameter up to 50 gauge (up to 1.3mm diameter)
Includes 4 machine heads, mounting screws and bushings