.* Nickel is the main element added to the copper alloy, and the copper nickel alloy is silvery white with a metallic luster, so it is called cupronickel.* Cupronickel Features: good mechanical properties, beautiful color, thermostable, strong corrosion resistance.* Product Application: Acoustic Guitar, Electric Guitar, Electric Bass GuitarSpecifications:Colors: SilverWidth: Approx.1.6mm & 1.8mm & 2.0mm & 2.2mm & 2.4mm & 2.7mm & 2.9mm to Choice Materials: Cupronickel (Nickel Copper Alloy)Features: Radian Guitar Fret WireLengths: Approx. 2.5 metersPackage Included:1 Pc. 2.5 meters wire fret guitarNote: Please refer to the measurement. A small measurement error is acceptable within the normal range. There may be a slight color difference due to monitor, camera or other factors, please refer to the physical item.