D'Addario Helicore Violin String Set, 3/4 Scale, Medium TensionScaled to fit 3 4 size violin with a playing length of 12 1 4 inches (310mm), these medium tension strings are optimized to the needs of a majority of players. The E string included with the H310 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. Helicore violin strings are crafted with a multi stranded steel core,