SOUND QUALITY: Keep the guitar tuning simple and accurate, mainly used for 6-string classic guitars (electric or acoustic). FUNCTION: These guitar tuning nails are perfect replacements for old and tuning nails. These guitar tuning nails have high sound quality through many tests. Gear ratio: 1:14, with heavy duty internal gear, fit 10mm (0.39inch) standard machine heads hole. These tuners are quality tuners made of zinc alloy construction Compatible with steel string (Electric or Folk) guitar Sets of 6pcs machine heads with mounting screws bushings and washers 10mm (13/32inch)-diameter pegholes required Heavy duty internal gear & standard size Location: 6 right handed tuning pegs Gear ratio: 1:14 Colour:As Shown Material:ABS+steel Size:10 x 15 x 3cm Package Contents: 6x guitar tuning Pegs 6x ferrules 6x screws Only the above package content, other products are not included. Note: Light reflection 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.