Flatwound strings feature a core that’s wrapped with flat (as opposed to round) windings. The result is a string that is smooth to the touch and produces a mellow, warm tone. Flatwounds are most commonly found on electric basses, but they’re also used by some players on guitars. Favored by some jazz bassists because of their smooth tone, flatwounds also reduce the amount of string noise produced. Flatwound strings are similar to the strings used on orchestral stringed instruments, such as double (upright) bass and cello.