Gauges 11-15-22-30-40-50.3 polishing steps produce an incredibly smooth finish on D'Addario Chromes ECG24 Electric Guitar Strings. Nickel-plated steel under winding on hex cores with chrome ribbon winding. G string is wound.D'Addario is the world's largest manufacturer of strings for musical instruments. Many top guitarists won't play any other brand. Regardless of your playing style, D'Addario has a set of strings that's right for your electric guitar.