Zyex Composite synthetic core strings produce an extremely warm, rich sound. Zyex is a new generation of synthetic material, creating strings that are extremely stable under drastic climatic conditions. Zyex strings settle in on the instrument very fast, within a matter of hours. Zyex has a warmer sound than most other synthetic core strings, and they have excellent projection. Excellent for use when a dark, rich tone is desired along with powerful projection. Scaled to fit 4/4 size violin with a playing length of 13 inches (328mm), heavy tension strings will allow for greater projection and volume potential. The D string included with the DZ310A set is aluminum wound.