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-Arté Nylon gives you the sound and feel that has come to define classical guitar. This Hard tension set provides rich, bold tone and strong projection. Designed and gauged for the smaller-scale Alto classical guitar, these normal tension strings provide a rich, deep and projecting tone.