Scaled to fit 4/4 scale violin with a playing length of 13 inches (328mm), these light tension strings allow for easier bow response. The D string included with the DZ310A set is aluminum wound. Packaged in uniquely-designed sealed pouches providing unparalleled protection from the elements that cause corrosion. Zyex synthetic core strings produce an extremely warm, rich sound. Zyex strings are made from a new generation of synthetic material, creating strings that are incredibly stable under drastic climatic conditions. Within a matter of hours, Zyex settles in on the instrument with a sound that is warmer than most other synthetic core strings. Zyex is also an excellent choice for use on bright sounding instruments.