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, theyre 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.