TREBLES STRINGS: E1 - B2 - G3ALLIANCE Fluoro carbon thinner strings offers a clear sound all over the trebles strings.Authorise infinity of nuances and colours and remain clear on very high position.G3rd assumes a perfect transition from B2 to A3. BASSES STRINGS: D4 - A5 - E6CORUM «Flexible Strings», wound nylon core.A Savarez innovation never done before.Outstanding nuances and colours of sounds, fast response like a stiffer string. Alliance Corum set is available in 3 tensions : Normal TensionHigh TensionMixed Tension