High quality and testing is fineNow you have no more worries as to how have to pack for the handling guitar, piano small knock a small Press button and let the strings out of tune The guitar will not off key if you lock the screw post when tune the guitar properly.Quality sealed machine headsAuto Locking Tuners (Tuning Pegs)Heavy duty internal gearModel: Guitar TuningGear Ratio:1:18Location:6RColour:ChromeMaterial:Metal + Steel GearPackage Contents:6 * Guitar Tuning Pegs(6R)6 * Ferrule6 * Threaded bushing6 * ScrewOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.