Gibson Coated Phosphor Bronze Acoustic Guitar Strings 11-52Developed and approved by our team of Master Luthiers, Gibson Coated Phosphor Bronze Strings are factory specification at the Gibson Acoustic facility in Bozeman, MT. These strings feature a high carbon steel, hex shaped core wrapped in phosphor bronze that is very thinly coated with a proprietary polymer. The result is unmatched durability that does not compromise vibrant tone like the rest. Discover the lush clarity and superior warmth that is