HI-Beam Bass Strings blend a stainless-steel wrap wire wound on a round core to produce great flexibility and musicality without harsh brightness. Their flexibility makes them easier on fingers and on frets. They are renowned for unusually long life, consistency and string-to-string balance. These are the string to choose for a bright and solid tone with great punch and ease of playing. Material: Stainless Steel. Hexagonal Core Wire with Ball End. • MFSKU LMR5-45 • UPC 600781001762