D'Addario Zyex Violin String Set with Aluminum D, 4/4 Scale, Light Tension 4/4 scale violin with a playing length of 13 inches (328mm) Light tension with Aluminum D string (also available with silver) Zyex synthetic core produces a rich, warm tone Short break-in time and excellent bow response provides superb playability and a broad tonal palette All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry