The Spirocore S32 and S33 are regarded as the most powerful, focused and high-performance cello strings. Their tonal essence is a wide, deeply resonating sound with a brilliant edge and clear focus. Their famous round "roaring" growl with superb projection has inspired cellists all over the world as a role model of sound imagination. They can be heard on countless top-level recordings made in the past six decades. Their very accurate bow response allows an immediate reaction to a bowing hand impulse at any bow-speed and even high bow pressure. Their flexible and elastic spiral core assures best fifth purity even at highest volume. These strings are designed with an outstanding lifespan and unsurpassed durability. Cellists of different levels trust Spirocore as their preferred string choice for the most challenging concert conditions. Furthermore, S3233 combines perfectly with all A- and D-strings in Thomastik-Infeld’s modular string selection.