The Pirastro Perpetual Series violin A string offers a rounder, more colorful sound with enhanced volume compared to traditional steel strings. Thanks to innovative materials and production methods, Perpetual strings also 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.