2 Set Musical instrument accessories: 1 Set x jack socket & 1 Set x Winding string Device Small and exquisite appearance, it is convenient to carry. excellent durability.Matched with an acoustic guitar nut, a classical guitar saddle, and 6 pieces of bridge pins. Light weight, it is easy to use.Suitable for most acoustic and electric guitars. Jack Socket Cover plate for Square Style.1/4 inch (6.35mm) jack socket.Material:Metal + copper.Has 3 total prongs Material:ABS + Plastic + Metal + copper Color:Black + + Random Color + Gold Pins Length:29.3mm String Winder Length:72mm / 42.7mm Nut Size:81.7mm Note: Random color, don't accept the specified color. Package Contents: 1 x jack socket 4 x mounting screws 1 x Winding string Device( random color ) 2 x pillow 6 x color guitar chords nail 6 x black guitar chords nail Only 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.