It is made from tempered high-carbon steel, also known as spring steel is very high carbon (C1075-C1090), and very high tensile strength (2620–2930 MPa / 380–425 ksi).

Diameters range from as small as 0.15 mm up to 4.8 mm (0.006 to 0.192 inch).

Steel Music Wire typically refers to high-carbon steel wire that is used in the construction of musical instrument strings, particularly for pianos, guitars, and other stringed instruments. This type of wire is known for its strength, durability, and ability to maintain tension, which are essential qualities for producing clear and resonant musical tones.

Music wire is often made from a specific type of steel known as high-carbon steel, which contains a higher percentage of carbon than regular steel. This increased carbon content enhances the wire's strength and hardness. The wire is drawn through a series of dies to achieve the desired thickness and uniformity.

In addition to its use in musical instruments, music wire is also utilized in various industrial applications, such as springs, orthodontic braces, and certain mechanical components where strength and flexibility are crucial. The term "piano wire" originated from its primary use in piano strings due to its ability to produce crisp and vibrant tones when properly tensioned.