Guitar tuners with heavy duty internal gears, sturdy and convenient This string winder allows for easy and efficient string changes; the notched head quickly and safely removes bridge pins. (Random Color) Guitar strap buttons include two nickel-plated steel buttons, felt washers, and mounting screws. Easy to installattach to your strap and securely screw into place. Specifications: Guitar tuners feature sealed machine heads and heavy duty internal metal gears Color: Black Material: Plastic + Metal Package Contents: 6 x Guitar machine head 6 x Ferrule 6 x Threaded bushing 6 x Screw 3 x Guitar picks (random color) 2 x Guitar strap button 1 x Guitar string winder Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in color. Measurement error allowance is +/- 1-3 cm.