D'Addario ENR71-5 XL Half Rounds Bass Guitar Strings 5-StringCoined 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