These D'Addario NYXL Electric Guitar Strings Medium 11-49 strings come in a pack of 12.NYXL1149 is designed with larger gauges for players who prefer moderate flexibility and a full, beefy tone.D'Addario NYXL guitar strings will bend farther, sing louder, and stay in tune better than any string you've played before. Envisioned, perfected, and manufactured by D'Addario in New York, this newly engineered, break-resistant, high-carbon steel core and plain steel alloy delivers a whole new level of freedom, confidence, and power. NYXL's provide more strength and up to 131% greater tuning stability by utilizing a completely reinvented wire drawing process coupled with a revolutionary "fusion twist" process for the plain steels. The reformulated nickel plated string windings have greater magnetic properties resulting in higher output and enhanced mid-range frequency response for more presence and crunch.NYXL's feature D'Addario's exclusive New York manufactured, high carbon steel alloy for unprecedented strength - play fearlesslyImproved tuning stability compared to traditional nickel wound strings - get in tune faster, stay in tune betterWound strings with enhanced mid-range frequency response in the 1 - 3.5 kHz range - more presence and crunch to cut through the mixNYXL1149 offers moderate flexibility and a full, beefy tone: Plain Steel .011, .014, .018, Nickel Wound .028, .038, .049Environmentally friendly, corrosion resistant packaging for strings that are always fresh