Gibson Vintage Reissue Electric Guitar Strings, Medium 11-50 Gauges 11-14-18p-30-42-50 All Gibson strings are bench tested and builder approved to bring the best sound possible out of your instrument Gauges 11-14-18p-30-42-50 Gibson Strings reinvented the modern guitar string They go back to the days of using only the finest pure nickel wire, slowly wrapping it over the highest quality Swedish steel "hex" core for maximum strength and stability