Kaplan violin E strings provide the traditional rich sound expected from high-quality steel E strings. Multiple options are available within the Kaplan line for a wide array of performance needs, including plain steel and aluminum wound. Also available is a unique non-whistling violin E string.Scaled to fit 4/4 size violin with a playing length of 13 inches (328mm), medium tension strings are optimized to the needs of a majority of players. Kaplan gold-plated violin E strings provide a rich, vibrant tone. The precision plating process also provides for a string with enhanced corrosion resistance. The Kaplan Non-Whistling E string is specifically designed to solve open E-string "whistling" occurrences. It produces a warm, rich tone that blends very well with lower strings. Kaplan Non-Whistling E includes one free Kaplan Ball End Adapter for use on single hook style fine tuners.- 4/4 scale violin with a playing length of 13 inches (328mm)- Medium tension- Precision construction provides quality and consistency string after string- Multiple E string options including gold-plated and non-whistlingAll D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry