Material: highquality plastic material, good durabilitySuitable for metric basins with a diameter of 6mm (approximately 0.24 inches);Compatible with style electric guitarCan replace damaged, messy or old guitar parts with volume control knobsMake your guitar look classic and stand out.Suitable for comfortable wearing in the hand and easy to install.productProduct Type: Electric Guitar KnobHole diameter: 6mmcolour: blackMaterial: plasticsize: 26x12mmPackage Contents:4xGuitar KnobsOnly 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 + 13cm.