NYXLs feature D'addario's exclusive New York manufactured, high carbon steel alloy for unprecedented strength – play fearlessly. Improved tuning stability compared to traditional nickel wound strings - get in tune faster, stay in tune better. NYXL1164 is optimized for 25.5 inch scale length: Plain Steel .011 .014 .018 Nickel Wound .028 .038 .049 .064. Environmentally friendly, corrosion resistant packaging for strings that are always fresh