D'Addario Helicore Viola String Set, Extra Long Scale, Medium TensionSized to fit extra long scale viola (body length 17 inches and larger) with a playing length of 15 3 4 inches (400mm), these medium tension strings are optimized to the needs of a majority of players. Packaged in uniquely designed sealed pouches providing unparalleled protection from the elements that cause corrosion. Helicore viola strings are crafted with a multi stranded steel core, resulting in optimal playability while producing a clear, warm