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.Scaled to fit 4/4 size violin with a playing length of 13 inches (328mm), these medium tension strings will allow for greater projection and volume potential. The D string included with the DZ310A set is aluminum wound, and the D string included with the DZ310S set is silver wound. Packaging in uniquely-designed sealed pouches provides unparalleled protection from the elements that cause corrosion.