D"Addario Pro-Arte Violin Strings offer a synthetic perlon core for the subtle, warm sound and feel of traditional gut strings. The inert core is practically unaffected by temperature and humidity, unlike gut strings. Precision wound with exotic alloys, D"Addario Pro-Arte violin strings are crafted for long, vibrant life. They are wound and polished on state-of-the-art computer controlled winding machines, then carefully hand-finished and inspected for optimum consistency. Professionals and serious amateurs love the bright timbre and focused response of Pro-Arte violin strings. String set fits 1/2 size violins.