D'Addario H512 4/4H D 4/4 Cello Strings

Cello D String with Stranded Steel Core Construction

The D'Addario Helicore Single D String is a 4/4 scale, heavy tension cello string designed for players who want a clear, warm tone with quick bow response. Built around a multi-stranded steel core — steel wires braided together into a flexible cable — this string delivers a balance of clarity and complexity that suits classical, contemporary, and crossover playing styles. The smaller string diameter contributes to fast bow response, while quality materials combined with skilled workmanship produce strings known for excellent pitch stability and longevity. As a single replacement D, it lets cellists swap out a worn or broken string without replacing the full set, restoring the focused articulation and tonal warmth that defines the Helicore line.

Technical Specifications

• Instrument: Cello
• String Name: D
• Size: 4/4 (full size)
• Tension: Heavy
• Core: Stranded Steel
• Ending: Ball End
• Quantity: Single string
• Country of Manufacture: USA (New York production facility)

Who It's For — Cello Players Seeking a Fuller Bow Response

The Helicore Single D String in heavy tension is the right choice for cellists who need a focused, articulate D with the resistance and projection that comes from a heavier gauge. Students, intermediate players, and professionals alike will find the stranded steel core offers a balance of clarity and complexity that pairs well with a wide variety of cellos and musical styles. The heavy tension option suits players with a more developed bow arm who want a string that rewards a fuller, more committed stroke, and it works equally well in solo repertoire, chamber music, and orchestral settings. Because the line is available in light, medium, and heavy tensions across the full 4/4 size, cellists can match the D string to the rest of their Helicore set for a consistent feel across all four strings.