D'Addario EJ45TT Pro Arte Dynacor Carbon nylon strings set Normal 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 nylon core processing technique to deliver amazing intonation, responsive attack, and crystal-clear projection, while still maintaining the essence of Pro-Arte’. Together with 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 tone. Normal Tension is best-selling tension, preferred for its balance of rich sound, great feel, and dynamic projection.