Thomastik-Infeld JF344 .043-.100 Flatwound Bass Strings Thomastik-Infeld JF344 .043-.100 Flatwound Bass Strings –  designed to reproduce the legendary tone of their Spirocore upright bass strings for electric bass. These flatwound strings are made with a nickel ribbon winding around a silk-wrapped steel core. This results in a string that has the mellow tone of a flatwound string with a slightly brighter attack and added midrange grunt. . The Thomastik-Infeld Jazz Flatwound Bass Strings pump out legendary flatwound tone with extra brightness and attack that’s perfectly suited for jazz. Features: Nickel ribbon winding provides maximum tonal depth Pliable steel core wire increases sustain Silk wrapping around the core wire offers a mellow tone and soft feel Flatwound construction extends string life Bright attack and midrange focus cuts through the mix