Thomastik Classic SExceptional steel string alternatives for concert, fingerstyle and folk guitarists. Specially designed for a string tension low enough to suit nylon string guitars, these strings bring you more of an acoustic sound to your classical guitar. The bass strings are nickel flat wound on a highly flexible steel core.Technical Details DTKR116NR.NoteMaterialGaugemmlbskgDTKN16Enylon tape wound on rope core0.0160.4016.307.40DTKN24Bnylon tape wound on rope core0.0240.6014.506.60DTKN25Gnylon tape wound on rope core0.0250.6314.006.40DTKR23Dsilverplated copper flat wound on rope core0.0230.5814.206.50DTKR31Asilverplated copper flat wound on rope core0.0310.8014.506.60DTKR39Esilverplated copper flat wound on rope core0.0391.0014.506.60