Designed to produce a deep, warm tone with smooth feel, D'Addario Tapewound Bass strings are wound using a flattened black nylon, which is polished to an ultra-smooth finish. These long-lasting, well-balanced strings are expertly engineered to provide optimal tension and are gauged to fit properly on standard bass saddles and nuts. Tapewounds may be used on fretted or fretless basses and are designed to deliver a vintage tone ranging from the "thump" of an upright bass to the focused depth of traditional flatwound strings.