1、Classical guitar strings use nylon string cores, which are comfortable and glossy to the touch and moderately soft. 2、Silver-plated copper alloy winding is anti-oxidation and anti-rust, with bright tone and strong penetrating power. 3、The acoustic guitar strings are made of stainless steel core, the copper alloy winding is rust-proof and not easy to break, and the vibration is even. 4、The electric guitar strings are made of high‑grade steel wire strings, wound with nickel‑plated alloy, and sealed to prevent oxidation of the strings. 5、These strings are of stable and durable quality and moderate tension, which is very suitable for beginners to practice. 6 x Guitar String Item Type: Guitar StringMaterial: Electric Guitar Strings: Nylon + copper alloy windingAcoustic Guitar Strings: Stainless steel + copper alloy windingElectric Guitar Strings: Steel wire + nickel-plated alloy winding