Hannabach 725 Goldin Classical Guitar Strings Medium/High Tension The trebles (EHG) are made of golden yellow SUPER CARBON. They sound softer and warmer than conventional carbon strings. The basses (DAE6) are characterised by a novel, high-density and highly resistant plastic soul. Winding wires are made of ?GOLDIN?, a newly developed golden yellow metal alloy (100% nickel and cadmium-free). Basses sound clearly and brilliantly. Obviously, you can combine Super Carbon trebles with any set of HANNABACH bass strings.