Check the listing for details. Thomastik-Infeld Jazz Flat Wound Bass Strings - 4-String 32" Short Scale. Condition: New. Listed at 116.55 USD. Capturing the Upright Bass Tone Looking for your new tonal obsession? The Thomastik-Infeld Jazz Flatwound Bass Strings are 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. Many bassists here at Sweetwater use Thomastik-Infeld strings to provide extra oomph to cut through the mix when they need to. The Thomastik-Infeld Jazz Flatwound Bass Strings pump out legendary flatwound tone with extra brightness and attack that's perfectly suited for jazz.