Royal Classics FL60 Flamenco Nylon guitar Strings, Medium-High Tension Royal Classics Flamenco set features high tension silverplated basses and traditional black flamenco trebles. Innovation meets tradition in this bright, expressive flamenco string recipe. Treble gauges: .71mm/.028", .81mm/.032", 1.02mm/.040" Bass gauges: .78mm/.031", .86mm/.034", 1.09mm/.043" Treated with an ultra thin proprietary anti-oxidant coating. Crafted in Spain by and for serious guitarists.