Rooted in generations of DAddario string making expertise Pro-Arte Nylon is our archetypal classical set. The bass strings are made with a multifilament nylon core and wound with silver-plated copper for an exceptionally warm and consistent response. Coupled with clear nylon treble strings which deliver sweet mellow highs Pro-Arte Nylon gives you the sound and feel that has come to define classical guitar. Normal Tension is our best-selling tension preferred for the balance of rich tone comfortable feel and dynamic projection.