Thomastik's Super Flexible violin strings feature a "rope-core" of steel, wound with chromium, including a chrome-wound E string. They produce a rich, dark tone, and are the warmest-sounding strings in Thomastik's line-up. Offering a perfect balance between a broad and focused tone, these medium-tension strings have improved elasticity, giving Super Flexible strings a more supple, comfortable feel under the hand, without sacrificing tonal complexity. Super Flexible strings have a rich, dark tone -- they're the warmest-sounding string that Thomastik offers. Comfortable under the hand, these supple, pliant string are a bit less responsive than higher-tension strings, offering reduced stiffness that facilitates left-hand playing. Super Flexible provides the player with good pitch stability -- once they are played in, they are resistant to changes in temperature and humidity. Super Flexible is manufactured with a spiral steel "rope core", wound with chromium -- this 15A set includes a chrome-wound E string, which can reduce buzz tones and whistling.