Thomastik-Infeld Superflexible string is an advance over conventional solid strings, lying midway in the path of evolution from the solid core to the advanced spiral core type.The solid core has been replaced by a cable-type structure made up of braided steel threads. This reduces the string's stiffness, improving its elasticity. A Superflexible string is incomparably responsive and its tone seems to literally radiate from the instrument, without the least harshness.Durability, tuning stability, and purity of open fifths are unsurpassed. Superflexible is a dependable all-round string for the discerning musician, at home with every type of bowing and in every musical situation.