Thomastik-Infeld Peter Infeld (PI)

Double Bass Strings Named for Peter Infeld, who led Thomastik-Infeld's string manufacturing for over four decades, the PI line brings the company's legendary spiral rope core into a new generation of bass strings built for projection and tonal color. Peter Infeld strings deliver a centered, well-balanced tonal core with real presence in the mid frequencies.

Players get a broad, controllable palette of sound colors rather than a one-dimensional voice — the string responds to how you shape it. Bow response is notably easy, and pizzicato players will find plenty of growl and sustain, making these strings equally at home in orchestral and jazz settings. The design pairs the brand's established spiral rope core with a new combination of winding materials to achieve this dual character.

Construction & specs (PI600 set, 3/4 size):

• Spiral rope core construction throughout G (PI61), D (PI62), A1 (PI63), and E1 (PI64) strings use a chrome outer winding . Extension C string (PI64C) is also available with a chrome winding along with a low B (“H2”) extension string (PI65) wound in a tungsten/chrome combination

• Vibrating string length of 104.0 cm (40.9"), fitting instruments up to roughly 110 cm Medium tension, balancing playability with projection Best for: Players — orchestral or jazz — who want a reliable, powerful mid-range voice with room to color their sound, without sacrificing ease of bowing.