This Kaplan violin E string is a solid steel E string with ball end and extra-heavy tension, for players seeking extra projection, power, and brightness. Sized for 4/4 size violin with a playing length of 13 inches (328mm).Kaplan violin E strings provide the traditional rich sound expected from high-quality steel E strings. Multiple options are available for a wide array of performance needs, including plain steel, aluminum wound, and gold plated. Also available is a unique non-whistling violin E string. D'Addario, the world's largest manufacturer of musical instrument strings, is known worldwide for unsurpassed quality and consistency. D'Addario continues to develop and manufacture exceptional strings and accessories for violin, viola, cello and double bass, incorporating innovative, environmentally friendly packaging that reduces waste and provides protection from corrosion. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.