D'Addario H415 LM Viola Strings

Helicore Viola E String — Flexible Steel-Core Response for Long-Scale Violas

The D'Addario Helicore Viola Single E String, Long Scale, Medium Tension is a standalone replacement E designed for violists playing a long-scale instrument with a body length of 16–16.5 inches (406–419 mm) and a 380 mm playing length. Unlike traditional solid-core steel E strings that can feel stiff and overly bright, this E is built on D'Addario's multi-stranded steel cable core — the same construction used across the entire Helicore orchestral string family — which gives the string a noticeably quicker bow response and a warmer, more complex tone. The E wire itself is plain tin-plated high-carbon steel (unwound), so it keeps the characteristic brilliance and projection of a steel E while gaining the flexibility and pitch stability of the stranded core underneath. D'Addario, the world's largest manufacturer of musical instrument strings, packages each E in a uniquely designed sealed pouch that protects against corrosion before installation.

Technical Specifications

• Instrument: Viola (long-scale)
• String: Single E replacement string
• Core: Multi-stranded steel
• String Material: Tin-plated high-carbon steel (plain/unwound E)
• Tension: Medium
• Ending: Ball end
• Playing Length: 15 inches / 380 mm
• Compatible Body Length: 16–16.5 inches / 406–419 mm
• Model Number: H415 LM
• Country of Manufacture: USA

Who This String Is For

Players seeking a responsive, warm-sounding E that settles in quickly and holds pitch through long practice or performance sessions will find this string a natural fit for their setup. Advancing students and intermediate players will appreciate the medium tension — the most popular choice in the Helicore viola line — which balances bow resistance with easy left-hand response across traditional and alternative styles including classical, folk, and crossover repertoire. The stranded steel core makes it a practical upgrade over factory steel E strings that feel thin or tinny, while the ball-end fitting means it drops straight into any standard viola tailpiece without modification. Those already using Helicore D, G, and C strings will find this E matches the family tone and response, completing a consistent set across all four strings.