The new D’Addario NYXL strings will bend farther, sing louder, and stay in tune better than any string youve played before. A new carbon steel core and nickel-plated steel winding provide not only a great feel and long life, but an up to 131% increase in tuning stability. The new “fusion twist” process for the plain strings alongside the reformulated nickel plating contribute to the higher output and increased midrange response.NYXL1164 is optimized for 25.5″” scale length: Plain Steel .011 .014 .018 Nickel Wound .028 .038 .049 .064