Sized to fit long-scale viola (body length 16-16 1/2 inches) with a playing length of 15 inches (380mm), these medium tension strings are optimized to the needs of a majority of players. This A string 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.