Thomastik-Infeld Spectrum Bronze Acoustic Guitar StringsThe ultimate bronze round wound acoustic string! The Spectrum Bronze strings are specially designed for the demands of professional recording, yet is also unsurpassed in live performance situations. A unique bronze formula, combined with Thomastik Infeld's mastery of mechanical filtering with their silk inlay technology, gives a full warm tone, with a sparkling clarity that lets you cut through a dense sound mix. Playing feel is very balanced and they