Zyex 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, making them excellent for use on brighter sounding instruments. Sized to fit long-scale viola (body length 16-16 1/2 inches) with a playing length of 15 inches (380mm), medium tension strings are optimized to the needs of a majority of players.