D'Addario K420B-7 E Violin Strings

Kaplan Golden Spiral Violin E String — Extra-Heavy Tension, Ball End

The D'Addario Kaplan Ball End Violin Single E String is a 4/4 scale replacement top string built for players who want the traditional richness of a steel E without the bright, sometimes piercing edge that plain steel can produce. At its core is precision-drawn, tinned high-carbon steel, finished with D'Addario's gold-plating process — the same treatment that defines the Kaplan Golden Spiral Solo line and gives these E strings their characteristic warm, vibrant tone. The extra-heavy tension option sits at the top of the Kaplan E string range, adding more resistance under the bow and a fuller fundamental that holds its own in louder ensemble settings. Each string is engineered and manufactured at D'Addario's New York production facility, with a short break-in time and excellent bow response so the player spends less time waiting for the string to open up.

Technical Specifications

• Instrument: Violin — 4/4 (full-size) scale
• String Type: Single E replacement string
• Material: Precision-drawn, tinned high-carbon steel with gold plating
• Tension: Extra-Heavy
• Ending: Ball End
• Origin: Made in the USA

Who This String Is For

The Kaplan Ball End Extra-Heavy E is the right choice for advancing violinists, professionals, and serious intermediate players who need a powerful, projecting top string that can carry across an ensemble without sounding shrill. The extra-heavy pull suits instruments with a darker overall voice that need more fundamental weight and resistance on the E, and it works well in larger acoustic spaces where a lighter E would disappear under the other strings. The ball-end fitting is compatible with most standard violin tailpieces designed for ball-end E strings. As part of D'Addario's Kaplan line — built for professionals and intermediate players — this E drops in naturally alongside Kaplan Amo or Vivo core sets, or can be mixed onto an existing A-D-G setup to upgrade the top string's tone, warmth, and bow response.