. * 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 Guitar Specifications: Colors: Silver Width: Approx.1.6mm & 1.8mm & 2.0mm & 2.2mm & 2.4mm & 2.7mm & 2.9mm for choice Materials: Cupronickel (Copper Nickel Alloy) Features: Radian Guitar Fret Wire Lengths: Approx. 2.5 meters Package Included: 1 pc. 2.5 Meters Fret Guitar Wire Note: 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.