Royal Classics DC10 JG Dynamic Carbon Nylon Guitar Strings, High-Tension Royal Classics JG Dynamic Carbon strings are comprised of high tension silver-plate basses and carbon trebles. JG Dynamic Carbon is the preferred set of Royal Classics founder and Flamenco virtuoso Juan Grecos. Treble gauges: (carbon formula) 0.60 mm /.024", 0.72 mm /.028", 0.88 mm/.035". Bass gauges: .78mm/.031", .89mm/.035", 1.12mm/.044" Treated with an ultra thin proprietary anti-oxidant coating. Crafted in Spain by and for serious guitarists.