Guitar tuners pegs with heavy duty internal , sturdy and convenientWith this string winder, you can replace and adjust your strings easy and labor-saving, the notched head can removes bridge pins quickly and safely. (Random Color) buttons contains two nickel-plated steel strap buttons, felt washers, and mounting screws. Easy to install, just attach it to your strap, and screw securely into locking positionSpecification Guitar tuners pegs have quality sealed machine heads and heavy duty internal MetalColour:blackMaterial:Plastic + metalPackage Contents:6 x Guitar machine head6 x Ferrule6 x Threaded bushing6 x screw3 x (random, do not accept the designation)2 x button1 x winderOnly the above package content, other products are not included.Note: Light 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.