043-056-070-100-136 (5-string)
• Premium Thomastik-Infeld Jazz Flat Wound.
• Long Scale 34" (Ball end to silk = 93cm)
• Flat Wound.
• Flexible round steel core.
• Warm, balanced, and full-bodied sound.
• Lower-than-average string tension.
• Smooth surface with minimal finger noise.
• Excellent sustain and dynamic response.
• Made in Austria.
The Thomastik-Infeld JF345 Jazz Flatwound is a premium string set for 5-string electric bass with a Long Scale (34"). Designed for bassists who demand a warm, full-bodied, and balanced sound, these strings combine a flexible round steel core with precision flatwound nickel ribbon winding to deliver exceptional playability, fast response, and the signature Thomastik-Infeld tone.
With lower-than-average tension, the JF345 strings feel smooth under the fingers while reducing stress on both the player and the instrument. The flatwound surface minimizes finger noise, making them ideal for jazz, blues, soul, R&B, reggae, classic rock, and fretless bass. Their rich fundamental, excellent sustain, and outstanding longevity have made them a favorite among professional bassists worldwide.