Thomastik JS113 represents the boutique peak of jazz flatwound strings — noticeably lower tension than La Bella with a more alive mid-range character. The unique nickel-wound roundcore construction preserves complex overtones that stainless flatwounds strip away, delivering a warmer yet more articulate voice. Austrian manufacturing precision shows in the consistency pack to pack.

Best for

Serious jazz guitarists willing to pay premium for the most refined flatwound tone available. Works brilliantly on ES-175, L-5, and high-end archtops. Also a surprising choice for Les Paul players who want flatwound feel without the lifeless tone solid-body flats typically produce.

Durability

Exceptionally long tonal life — 8-12 months of satisfying tone is standard. The nickel roundcore construction is softer than stainless but the flatwound wrap protects it. Break strength is excellent; Thomastik quality control keeps pack variation minimal.

Climate notes

Lower tension and flat wrap combination provides good humidity resistance. Nickel wrap is slightly less corrosion-resistant than stainless flats from La Bella or GHS, but overall life remains much longer than roundwound alternatives in any climate.

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Pros

The premium jazz flatwound — refined mid-range that stainless flats can't match
Lower tension than La Bella — easier on fingers and hollowbody tops
8-12 month typical lifespan
Austrian manufacturing precision — industry benchmark for consistency

Cons

Premium pricing — 2x the cost of La Bella 20P and 4x standard roundwound
Niche availability — often requires online-only orders
Warm voice unsuited to genres outside jazz and mellow styles

Best for these guitars

Picked by community consensus

Gibson

ES-175

Thomastik-Infeld JS113 Jazz Swing 12-53 on the Gibson ES-175 is the Joe Pass jazz-virtuoso lineage that defines solo-jazz-guitar tradition — Pass, the Hungarian-American jazz solo master who recorded the seminal Virtuoso (1973) on his ES-175, ran Thomastik flatwounds across Pablo Records sessions with Oscar Peterson, Ella Fitzgerald, Count Basie. As Thomastik-Infeld's own tagline puts it: "Jazz Swing's list of players reads like a Jazz Hall of Fame." Pass's solo-jazz approach — chord-melody bass-line-and-melody simultaneously — depended on the smooth, woody flatwound feel that lets pick slide across strings without finger-noise. Conventional wisdom: ES-175 already has D'Addario NYXL 10-46 as community pick (Larry Carlton modern-D'Addario angle). This is the OPPOSITE — Pass's vintage Thomastik flatwound legacy. Editorial logic: Thomastik JS113 (hand-wound in Vienna by Thomastik-Infeld since 1919) is the European-jazz heritage match — warmer than Chromes, smoother than Pyramid Gold, the exact tone Pass made canonical on 'Stella by Starlight' / 'Have You Met Miss Jones'. Best for ES-175 owners chasing Pass's chord-melody solo-jazz lineage; skip if you want Carlton's modern roundwound for fusion-blues.

Gibson

Les Paul

Unexpected pick for Les Paul players wanting buttery flatwound feel without losing output.

Eastman

AR371CE

TI JS113 transforms AR371CE from budget Eastman to gigging-jazz-tier instrument.

D'Angelico

Premier DC

Premium upgrade — TI JS113 is the string that distinguishes Joe Pass and Pat Metheny jazz-tier archtops. Transforms the budget D'Angelico into a genuine jazz instrument tonally.

Ibanez

AF75

Premium path — TI JS113 transforms the AF75 from budget Artcore to a gigging-tier jazz instrument indistinguishable from far more expensive archtops.

Gibson

ES-335

Premium Austrian jazz flatwound for serious ES-335 players.

Gibson

ES-345

Premium jazz flatwound when ES-345 goes full hollowbody jazz territory.

Gibson

L-5

Premium Austrian jazz flat — L-5 owners already pay premium prices.