Thomastik SB113 13-57 Medium Gauge Spectrum Bronze Acoustic Guitar Strings

Thomastik-Infeld SB113 Spectrum Bronze Acoustic Guitar Strings – Medium (13–57)

Thomastik-Infeld SB113 Spectrum Bronze strings are premium, Austrian-made acoustic strings crafted for players who want powerful projection, tonal depth, and exceptional clarity. This medium 13–57 set delivers increased volume and headroom while maintaining Thomastik’s signature balance and refinement.

Built with a highly flexible round core and precision bronze wrap, Spectrum Bronze strings offer outstanding tuning stability, long sustain, and remarkable note separation. The medium gauge provides a strong, piano-like low end, rich midrange presence, and clear, controlled highs—ideal for flatpicking, heavy strumming, and players who demand dynamic range.

Despite the heavier gauge, the flexible core design keeps the feel responsive and musical rather than stiff.

Gauges: .013, .017, .026w, .035, .047, .057
Wrap Material: Bronze
Core: Flexible Round Core
Tone Profile: Full, powerful, balanced
Feel: Solid tension with refined responsiveness
Made in Austria

A premium medium gauge set delivering strength, clarity, and world-class craftsmanship for serious acoustic players.