NYXL09564SB is optimized for the variable scale length of 7-string .strandberg* guitars (25.5'' - 26.25'') : Plain Steel .0095 .013 .016 Nickel Wound .024 .034 .046 .064. NYXL's 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.. Wound strings with enhanced mid-range frequency response in the 1 - 3.5 kHz range ? more presence and crunch to cut through the mix.. Environmentally friendly, corrosion resistant packaging for strings that are always fresh.. .