EJ40 Silk & Steel strings are designed and gauged specifically for guitarists who use traditional fingerstyle methods and prefer a warm, mellow tone. D'Addario Silk & Steel strings couple silver-plated copper wrap wire with silk for easy fingering and a mellow tone. They are excellent for smaller body acoustic guitars and preferred by many folk players. Designed and gauged for fingerstyle guitarists who prefer a warm, mellow tone Silk interwindings for soft, easy feel on fingers Environmentally friendly, corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .011, .014, Silk & Steel Wound .023, .028, .038, .047