Product Description Coined the “third type of string,” XL Half Rounds bass strings are an excellent medium between round wound and flat wound strings. Half Rounds have a smoother feel than round wound strings, but a fuller tone than strings that are flat wound. Made with a high carbon steel core and pure nickel wrap wire, they’re finished with a precision grinding process to provide a smooth feel and reduced finger noise, with tone that's comparable to round wound bass strings. Made for 5-string basses, 45-130 Regular Light gauge strings take our most popular bass gauge and add a low B-string. From the Manufacturer ENR71-5's combine the playability of common 45-130 gauged 5-string sets with the benefits of an exclusive "Half Round" manufacturing process. This set is fit for long scale basses with a string scale length of up to 36 1/4 inches.D'Addario Half Round bass strings are wound with pure nickel, then precision ground, leaving the outer surface smooth and semi-flat while retaining the flexibility of round wound strings. D'Addario's exclusive heat treating process ensures that Half Rounds retain their round wound brightness and sustain.D'Addario, the world's largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. D'Addario's innovative packaging reduces waste and provides protection from corrosion. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.