Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.The guitar tuning keys are made of high-quality metal with an elegant retro look and are sturdy and , giving you high-quality classic design buttons for easy, smooth and precise tuning.4.The tuners prevent the guitar from being exposed to the air, reducing rust and making it more . High-quality internal gears can effectively prevent the screw from sliding.5.These stops are compatible with 12-string guitars. It's great for replacing old and dirty tuning plugs, and also great for tuning guitars. Precision engineering ensures smooth adjustment every time. With these stops, you can tune your guitar strings quickly and accurately.6.Set comes with 12pcs string guitar heads, 12pcs ferrules and 14pcs screws.7.Equipped with screws and sleeves for easy installation. Guitar strings that are tuned are not easy to loosen.Specifications:Material: MetalColor: ChromeBrand name: BQLZRSize: 165x35.5x42mm/6.5inchx1.4inchx1.65inch (LxWxH)Weight: 338 gPackage include:2 x Guitar Machine Heads12 x Ferrule14 x Screws1 x Screwdriver