CLASSIC GUITAR CRK. The legendary Adamas Phosphor Bronze new Thomastik-Infeld CRK CLASSIC. Carbon/nylon hybrid material guitar strings that captivate with the brilliance and power of carbon strings and have the warm, rich sound usually only found on nylon strings. The new hybrid material from Thomastik is inspiring with its immediate response and translates every impulse of your fingers. Treble strings: Carbon-nylon hybrid material, clear, see-through. E1: CPK25 0.63mm/.025“, 9.4kg/20.72lbs, H/B2: CPK28 0.719mm/.028“, 6.9kg/15.25lbs, G3: CPK34 0.86mm/.034“, 6.4kg/14.10lbs, Bass strings: Multi-filament core, silver-plated copper wire, separate wound. D4: CRK30 0.76mm/.030“, 7.2kg/15.87lbs, A5: CRK36 0.91mm/.036“, 6.8kg/14.99lbs, E6: CRK47 1.20mm/.047“, 7.0kg/15.43lbs, Set CRK125HT High Tension: 74.68lbs/42.5kg.