Dean Markley Blue Steel Acoustic Guitar Strings, cryogenically treated for enhanced performance. Available in the following gauges: DM2034 Light .011 .014 .022w .032 .042 .052 DM2036 Medium Light .012 .015 .025w .030 .044 .054 DM2038 Medium .013 .017 .026w .038 .048 .058 Dean Markley Blue Steel acoustic guitar strings are cryogenically treated in liquid nitrogen, to give them powerful new tones and extremely long life. Their phosphor bronze outer wrap is 92% copper and 8% zinc, which gives them a warm and expressive tone, spanning the full frequency spectrum of acoustic guitar from deep bass to tweeting trebles. Because they are stronger, they stretch less as they age, giving you a much longer playing life than ordinary phosphor bronze strings. Using the finest quality materials, and modern manufacturing and cryogenic treatment processes, Dean Markley Blue Steel acoustic guitar strings have become string of choice of performing professionals and those guitarists who know the difference Blue Steels can make. The World's Most Trusted String. Dean Markley strings are made in the USA. Available for Order