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Sweetwater
4.5 (39)
$99.99
Guitar Center
5.0 (17)
$99.99
Amazon
4.8 (654)
$85.88 $85.16 $0.72
Reverb
5.0 (17)
$59.56 New
$70.00 Used
Musician's Friend
5.0 (52)
$99.99
zZounds
5.0 (1)
$85.95
Thomann
4.8 (803)
$58.00

Price History

Based on price data from 5 merchants for "Thomastik-Infeld Jazz Flat Wound JF344 / 43-100". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Crafted for the discerning bassist, the Thomastik-Infeld Jazz Flat Wound JF344 strings offer a harmonious blend of traditional warmth and modern clarity. These flatwound strings, meticulously wound with a nickel ribbon over a silk-wrapped steel core, deliver a tone reminiscent of the classic upright bass, now accessible for your electric bass. Known for their versatility, they provide the smooth, mellow sound of a flatwound string, with an unexpected brightness and midrange presence that ensures your bass lines stand out in any mix.

These strings are not just about sound; they’re about feel. The silk wrapping offers a soft touch, making extended playing sessions a breeze. Whether you're playing smooth jazz or cutting through a dense rock mix, these strings promise a consistent, reliable tone. With a highly pliable steel core, they enhance sustain and offer extended durability, making them a perfect choice for both studio and stage performances.

Key Features:

  • Long scale design, suitable for most electric basses
  • Nickel ribbon winding for maximum tonal depth
  • Silk wrapping around a pliable steel core for a soft feel
  • Flatwound construction for a longer string life
  • Bright attack with a focused midrange
  • Gauges: .043 - .056 - .070 - .100

Product specs

Guitar Type Electric Bass
Number of Sets 1
Coated No
Gauges .043, .056, .070, .100
Winding Type Flat
Core Material Steel
Winding Material Nickel
Scale Length Long

FAQs

What tone can I expect from the Thomastik-Infeld JF344 Jazz Flatwound Bass Strings?

These flatwound strings produce a warm, smooth tone with a vintage feel, ideal for jazz and Motown styles. They emphasize midrange frequencies and provide a mellow sound with less brightness compared to roundwound strings.

Are the Thomastik-Infeld JF344 strings suitable for long-scale bass guitars?

Yes, the Thomastik-Infeld JF344 Jazz Flatwound Bass Strings are designed for long-scale bass guitars, ensuring proper tension and intonation across the fretboard.

How does the flatwound design of the Thomastik-Infeld JF344 affect playability?

The flatwound design offers a smooth surface, reducing finger noise and providing a comfortable playing experience. This makes them an excellent choice for players seeking a silky feel and reduced friction.

What is the gauge range for the Thomastik-Infeld JF344 strings?

The Thomastik-Infeld JF344 Jazz Flatwound Bass Strings have a gauge range of .043 to .100, providing balanced tension and versatility for various playing styles.

Do Thomastik-Infeld JF344 strings require a special setup for my bass guitar?

While these strings are compatible with most long-scale bass guitars, you may need to adjust your bass's truss rod and action to accommodate the different tension and gauge of flatwound strings.

Ben Bynum

Ben Bynum

Flatwound Bass String Comparison - La Bella vs. Thomastik-Infeld

Video thumbnail for Flatwound Bass String Comparison - La Bella vs. Thomastik-Infeld by Ben Bynum

Flatwound Bass String Comparison - La Bella vs. Thomastik-Infeld

Ben Bynum

Ben Bynum

Video thumbnail for THOMASTIK JF344 Jazz Flat Wound 43-100 fresh set improv on Ernie Ball MUSIC MAN StingRay by Bart FUNK Bass

THOMASTIK JF344 Jazz Flat Wound 43-100 fresh set improv on Ernie Ball MUSIC MAN StingRay

Bart FUNK Bass

Bart FUNK Bass

Video thumbnail for Thomastik JF344 Jazz Flat Wound 43-100 - TONE TEST by Bart FUNK Bass

Thomastik JF344 Jazz Flat Wound 43-100 - TONE TEST

Bart FUNK Bass

Bart FUNK Bass

Video thumbnail for FLAT WARS : Thomastik JF344 vs Sadowsky SBF45 on Music Man StingRay [NO TALKNG] by Bart FUNK Bass

FLAT WARS : Thomastik JF344 vs Sadowsky SBF45 on Music Man StingRay [NO TALKNG]

Bart FUNK Bass

Bart FUNK Bass

Video thumbnail for Wings - Rockestra theme [bass cover] by Marco Pivato

Wings - Rockestra theme [bass cover]

Marco Pivato

Marco Pivato

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Thomastik-Infeld Jazz Flat Wound JF344 / 43-100.

Setup and maintenance

  • Owners note the low tension of JF344 strings can complicate setup, but once adjusted, they offer a phenomenal playing experience with strong mid-presence.

    Source

Comparisons

  • JF344 strings are often compared to La Bella Low Tension Flats, noted for having a slightly higher tension but a more traditional flatwound sound.

    Source
  • LaBella's surface is smoother than TI's, which are noted to be slightly rougher, impacting playability feel.

    Source

Features and functionality

  • JF344 strings offer versatile sound range, capable of achieving Motown tones with a tone knob adjustment and even allowing for slap bass with increased high frequencies.

    Source

User experience

  • Players appreciate the low tension of JF344, allowing for longer play sessions without fatigue, and note the strings last for years, making their high price justified.

    Source
  • Some users report TI strings can feel like "overcooked spaghetti" due to their extremely low tension.

    Source
  • Owners mention TI strings can sound unbalanced out of the box, but improve greatly once played in.

    Source

Other

  • JF344 strings are reported to mellow out in their high frequencies after a few months, maintaining a pleasant tone over time.

    Source

Use cases and applications

  • TI Jazz Flats are highlighted for rock music, especially when played with a pick, providing punchy midrange that sits well in the mix.

    Source

Value and pricing

  • A user reports having a set of TI strings for almost 10 years, emphasizing their longevity and sustained sound quality.

    Source
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5.0 out of 5

Based on 2 Reviews and 4 Ratings

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tschaggon

Fat strings for fat bass

I have the five string version of this product and this strings really are fat. But like all flatwound strings, it is super nice to do slides and stuff like that, because you only hear the tone and practically no noise you do not want to hear. I love these strings and will never turn back to others.

skylinerr

best flats

started getting these instead of rounds for my p bass and I really love them they sound like a fresh set of roto flats (my favourite but only when fresh) but these stay with that bright sound they are awesome

Genres:

Artist usage

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See how Pino Palladino uses Thomastik-Infeld Jazz Flat Wound JF344 / 43-100

Pino Palladino

Bassist

Nine Inch Nails

...
Verified via YouTube

shown in the video at 5:10

See how Joe Dart uses Thomastik-Infeld Jazz Flat Wound JF344 / 43-100

Joe Dart

Bassist

Vulfpeck

...
Verified via Photo

Joe Dart mentioned in a Reddit AMA that he uses Thomastik-Infeld Jazz Flat Wound JF344 / 43-100 strings on the bass crafted by Jack Stratton, which served as the prototype for the Joe Dart bass.

See how Carol Kaye uses Thomastik-Infeld Jazz Flat Wound JF344 / 43-100

Carol Kaye

Bassist, Music Producer

The Grass Roots

...
Verified

On the official Thomastik website:

“It’s safe to assume, having done over 10.000 record dates, movie scores, and TV-film shows in the 1960s and 1970s as 1st call recording electric bassist in Hollywood (Musicians Union Local 47), I had specific sound needs: this not only meant 'cleanest sounds', but also instant response, and long-lasting great strings that could take the beating of recording/playing hard on 10-16 hours a day as that’s the amount of recording work there was back then.

When I returned to the Music Recording Business in the late 1990s, I needed better strings than ever, and Thomastik-Infeld strings were brand new back then. I was pleasantly surprised, no, absolutely astounded is the word! I could record on your new JAZZ FLAT WOUND strings instantly (no break-in period) and what great, powerful, yet sensitive bass sounds I got out of them: in-tune musical from start to finish with power plus, and a feeling like silk to play on as well as right sounds I can trust for recording and live playing in all styles of music!

We all need great sounds and the strings are a big part of that. THANK YOU For Such Great Strings!

I could easily get such fab sounds with my Permanent Flatwound 60s Sounds Power-Strings for years! I mean it, the words I said, Thomastik-Infeld strings are every bass player’s dream strings.

PS: I also love your GEORGE BENSON flat wound strings for real Jazz! The Finest!”

Also on her official website:

“The Rolls Royce of all strings for that vital 1960s powerful sound with great feel.”

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Thomastik-Infeld Jazz Flat Wound JF344 / 43-100, it is most commonly used with the following gear.

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