A revolution in tonal sound and color for the discerning musician, Peter Infeld (PI) strings produce a rich spectrum of sound colors, the perfect blend of power and elegance and a wide dynamic range. The strings deliver instant bow response as well as superior tuning ability. The soft left hand feeling brings out the best in you and your performance. Choose fromTin, Gold and the unique Platinum plated and thus very powerful E-strings, and the Aluminum or Silver wound D-strings to achieve a made-tomeasure sound for each individual instrumentand player.