D'Addario H412 LM Viola Strings

D'Addario Helicore Viola D String — Long Scale, Medium Tension

The D'Addario Helicore Viola Single D String in Long Scale, Medium Tension is a single replacement string drawn from one of the most widely played orchestral string families in the world. Helicore viola strings are crafted with a multi-stranded steel core, blending the strength of steel with the flexibility of a braided cable for a playing feel that responds quickly under the bow. The D string sits as the second-highest voice in the viola's C–G–D–A tuning and is often the first string to show wear from repeated contact, so a quality replacement matters for keeping the instrument's voice consistent. Designed, engineered, and manufactured at D'Addario's New York production facility, this single string matches the construction of the full Helicore Viola set and can be swapped in without rebalancing the rest of the instrument.

Technical Specifications

• String Designation: D (single replacement string)
• Instrument: Viola
• Scale: Long Scale (full-size viola)
• Tension: Medium
• Core: Multi-stranded steel core
• Ending: Ball end
• Origin: Made in the USA at the New York production facility

Who It's For — And Which Playing Styles It Suits

The Helicore Viola D String is the right choice for viola players who need a responsive, stable replacement string that fits a wide range of musical styles. Its stranded steel core produces a clear, warm tone with quick bow response, making it equally at home in classical orchestral repertoire, chamber music, and alternative styles such as folk, bluegrass, jazz, and crossover playing. Medium tension offers a balanced feel under the left hand — firm enough for articulate bow control and projection, yet flexible enough for expressive phrasing and quick passage work. The ball-end fitting installs quickly on any standard viola tailpiece, which makes this single string a practical option for students replacing a worn D string, intermediate players refining their setup, and professionals who want a reliable spare in their case. Pair it with the matching Helicore A, C, and G strings to maintain a consistent voice across the full instrument.