Known for their intense warm and dark tone, Thomastik-Infeld Superflexible violin strings are made of a steel rope core and offer power and durability while facilitating left-hand playing. Known to reduce stiffness through improved elasticity, these strings feature a more flexible feel under the fingers.  Superflexible strings are an excellent choice for the violinist looking to warm up a bright instrument, or bring a more rounded tone to an instrument that sounds a little edgy. Thomastik Superflexible strings are comparable to Thomastik Spirocore in warmth, with greater sweetness of sound.