Feature: 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.Made of copper, it's glossy, silver color.4.Suitable for electric guitar.5.Great guitar parts for replace your old or damaged string retainers.Specification:Color: SilverMaterial:CopperSize: approx 13 x 5 x 4mm/0.51 x 0.2 x 0.16 inch (L x W x T)Hole Diameter: approx 2.55mm/0.1 inchScrew Length: approx 8.35mm/0.33 inchWeight: 4gPackage include:2 x String Retainers2 x Screws