EJ40 Silk & Steel strings are designed and gauged specifically for guitarists who use traditional fingerstyle methods and 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 0.011, 0.014, Silk & Steel Wound 0.023, 0.028, 0.038, 0.047.