Mainly constructed of steel material, anti-rust, high performance of stability and durability. Complete set with 3 left and 3 right machine heads and other fixing accessories, easy to install. Tuning fast and accurately, difficult to be out of tune. Exquisite looks with perfect workmanship and high-technology, good-looking, very easily matched for your guitar and also have good decoration effect. perfect replacement parts for your folk/electric guitar. Type: 3L Suit for: Folk/Electric Guitar Colour: silver Material: A3 steel Package Contents: 6 * guitar knob 6 * iron master bushing 12 * screws 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.