Check the listing for details. D'Addario Helicore Cello String Set, 4/4 Scale, Medium Tension. Condition: New. Listed at 139.99 USD. D'Addario Helicore Cello String Set, 4/4 Scale, Medium Tension Authorized dealer over 40 years USA. "Gary Ritter Strings Shop" - South Lyon, Mich. Shipping outside lower 48 states USA and HI. - AK. - PR. will be calculated. 4/4 size cello with a playing length of 27 1/2 inches (700mm) Medium tension Stranded steel core provides optimum playability and produces a clear, warm tone Quick bow response and optimal playability All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry Helicore cello strings are crafted with a multi-stranded steel core, giving them great playability and a clear, warm tone. The smaller string diameter provides quick bow response while the quality of materials and workmanship craft a string with excellent pitch stability Helicore has long been recognized as one of the most versatile stranded-steel core string lines available. Used by professionals and students alike, Helicore suits many playing styles and is often preferred by alternative-style and electric instrument players. nd longevity.