Thanks to innovative materials and production methods, the Pirastro Perpetual Series viola strings provide a tonal fullness and radiance with a reliability that allows the player to trust in the strings tuning stability immediately upon installation. Designed for volume, carrying power and a precisely focused projection, the clarity of sound remains just as powerful from extreme squeals to the most sensitive whisper. Perpetual viola strings react in an ideal way to the finest nuances in bow speed and pressure enabling the musician to play with an extreme range of dynamics and expression. The innovative core material allows a comfortable smoothness during legato, shifting, string crossings, double stops and chords. Perpetual viola strings react to the finest nuances in bow speed and pressure, enabling the musician to play with an extreme range of dynamics and expression. The Perpetual viola A string features a steel core with chrome steel wrap and removable ball end.