TREBLES STRINGS: E1 - B2 - G3Improved nylon, plain strings.Clear sound of a transparent NYLON.Large choice of colours.Traditional usual gauges. BASSES STRINGS: D4 - A5 - E6CORUM «Flexible Strings», woundnylon core. A Savarez innovationnever done before.Outstanding nuances andcolours of sounds, fast responselike a stiffer string. New cristal Corum set is available in 3 tensions : Normal TensionHigh TensionMixed Tension