The Pirastro Perpetual double bass strings were mainly developed for pizzicato playing to provide the player with a comfortable left-hand feel, fast articulate response and strong energetic tone. Using a uniquely designed, extremely flexible steel rope core, the Perpetual double bass strings provide incredible stability and tremendous power. With a little adjustment on the players end, the sound can be manipulated to suit a wide variety of styles. A powerful and focused low end gives way to a full, sophisticated upper register and, when played arco, the Perpetual bass strings have a clear yet complex tone with an intense power that can be felt by the musician as well as the listener. With their effortless left-hand feel and an astonishingly quick bow response, the Perpetual bass strings allow the player to practice for long periods of time with little fatigue.