Thomastik-Infeld Plectrum Bronze Light Acoustic Guitar Strings are soft sounding and have low tension on the bottom end. The E and B plain strings are made of brass coated steel. The wound strings have a silk inlay combined with a highly flexible steel core. The A, D, and G strings are polished bronze flatwound, while the low E is polished bronze roundwound. Gauges: .011 - .014 - .019 - .027 - .036 - .050.