D'Addario EJ44TT Pro Arte Dynacor Titanium classical nylon stringset, Extra Hard tension. Pro-Arte’ Dynacore strings connect the tradition and foundation of D’Addario classical string making with contemporary advancements in production technology. Dynacore basses use a revolutionary twisted multifilament composite core processing technique to deliver unparalleled intonation, responsive attack, and crystal-clear projection, while still maintaining the essence of Pro-Arte’. Together with D'Addario precision Titanium trebles, which supply distinct balance and increased resonance in the top-end, Pro-Arte’ Dynacore strings are an amazing blend of tradition and innovation, creating a truly unique, contemporary sound. This Extra Hard tension set provides maximum resistance and projection.