D'Addario ECG25 Chromes Flatwound Light. Chromes are the world's most popular flatwound strings and revered for their warm tone and ultra-smooth feel. Stainless steel underwindings on hex cores build a foundation for the delicate outer ribbon winding. After the winding is applied, each string goes through 3 polishing steps. D'Addario Chromes Flatwound Electric Guitar strings are famed for their smooth feel and warm, mellow tone. The strings are wound and then polished to produce an incredibly smooth surface Gauge: .012-.053