Scaled to fit 4/4 size violin with a playing length of 13 inches (328mm), these light tension strings allow for easier bow response. The E string included with the H310W set is an aluminum wound steel-core E string. 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, resulting in optimal playability while producing a clear, warm tone. The smaller string diameter provides quick bow response. Premium quality materials combined with skilled workmanship produces strings known for excellent pitch stability and longevity.