Thomastik Classic N Superlona for GuitarHeavy duty nylon strings, with a choice of two styles of basses (E, A, D): either silver plated copper roundwound (CR127), or chrome steel flatwound (CF127). Classic N strings areeasy to play, and represent an excellent value in a student or practice string. CF128 has a wound G-3rd. CR128 hybrid set contains a high density synthetic fiber G-string.Technical DetailsNR.NoteMaterialGaugemmlbskgDTCN27Eplain nylon0.0270.6915.16.90DTCN31Bplain nylon0.0310.8012.25.50DTCF27Gchrome steel flat wound0.0270.6914.26.50DTCP33Ghigh density synthetic fiber0.0330.8513.36.10DTCN39Gplain nylon0.0391.0012.35.60DTCR30Dsilverplated copper round wound0.0300.7514.76.70DTCF30Dchrome steel flat wound0.0300.7614.26.50DTCR35Asilverplated copper round wound0.0350.9014.26.50DTCF35Achrome steel flat wound0.0350.9014.06.40DTCR43Esilverplated copper round wound0.0431.1013.56.10DTCF45Echrome steel flat wound0.0451.1014.06.40SetsDTCR127DTCR128DTCN127DTCN128round woundround woundflat woundflat woundDTCN27DTCN27DTCN27DTCN27DTCN31DTCN31DTCN31DTCN31DTCN39DTCP33DTCN39DTCF27DTCR30DTCR30DTCF30DTCF30DTCR35DTCR35DTCF35DTCF35DTCR43DTCR43DTCF45DTCF45