Scaled to fit 4/4 size violin with a playing length of 13 inches (328mm), these medium tension strings are optimized to the needs of a majority of players. The HE310-5 (five string) set includes a properly sized and gauged low C string for violins designed to use five strings. The E string included with the HE310-5 set is a plain steel E (tin-plated high-carbon steel) with no winding. Packaged in uniquely-designed sealed pouches providing unparalleled protection from the elements that cause corrosion.