The Dynacore bass strings in this XT set use a revolutionary multi-filament nylon core processing technique to deliver unparalleled intonation, responsive attack, and crystal-clear projection—and with addition of proprietary XT coating, a significantly extended lifespan. Coupled with Carbon trebles, which are the brightest, best projecting trebles, XT Dynacore is the most advanced classical string available. This Normal Tension set is best-selling, preferred for its balance of rich tone, comfortable feel, and dynamic projection.