Hannabach Classical Guitar Strings Hannabach Super Carbon Trebles / Goldin Basses The trebles (e, b, g) are made of a golden yellow Super Carbon fiber. They sound softer and warmer than conventional carbon strings. The basses (DAE) are characterized by a novel, high-density and highly resistant synthetic core. The Goldin windings are made of a newly developed golden yellow metal alloy (100% nickel and cadmium-free). The basses sound clearly and brilliantly.