Detail 01
Flatwound construction
Smooth outer wrap kills finger noise and fret clank, and cuts the metallic top end roundwounds give you.
Product detailSKU #1274115036579
ThomastikJF345 Flatwound 5-String Jazz Bass Strings
Sale
Independent shopping perspective
The Korena take
Flatwound 5-string bass set in light gauges, .043–.136. For players wanting thumpy, low-tension flats with a fundamental-heavy voice.
Strong match
Who this is for
- Motown, soul, and reggae lines that want thump over sizzle
- Players with hand fatigue who need lower tension across the neck
- Fretless bassists protecting the fingerboard from roundwound wear
Consider the trade-offs
When to look elsewhere
- Slap and pop players who need bright, aggressive top end
- Anyone wanting the stiff feel of heavier flats under a hard pick attack
- Drop tuners — the .136 B is the floor here, not a heavy-gauge option
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
.043–.100 E-to-G gauges
Light for flats. Easier to fret and bend, with less string-to-body pull than typical flatwound sets.
Detail 03
.136 B string
Thick enough to keep the low B defined rather than floppy, though it sits at only 34.83 lbs tension.
Detail 04
Tension ranges 31–37 lbs per string
The A at 31.30 lbs is the loosest in the set, so it may feel slightly softer under your fingers.
Detail 05
JJ pickup configuration
Voiced with Jazz Bass style single-coils in mind, where flats emphasize the fundamental over harmonic bite.
Final check
Know before you order
- 01Lower tension may need truss rod and saddle height adjustment after installation
- 02Flats need break-in time before the tone settles
- 03Check your bass's string spacing and scale length before ordering a 5-string set
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will these fit a 35-inch scale 5-string?
Check the set's winding length against your bass before ordering. Long-scale 5-strings vary, and a set wound for 34 inches can put wrap at the nut or tuning post.
02How are these different from roundwounds?
The outer wrap is flat, not ribbed. That means no finger squeak, far less fret wear, and a darker tone with the metallic zing pulled back.
03Do I need a setup after switching to these?
Likely yes. The tension differs from what your bass is currently set for, so neck relief and action will shift. Budget for a truss rod tweak at minimum.
04Are these good for slap bass?
Not really. Slap depends on bright, clanky top end that flats deliberately remove. These are built for thump and fundamental.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsPickups & controls
- Pickup Configuration
- JJ
5 detailsPlayability
- D String
- Gauge: .056 in.; Tension: 37.47 lbs.
- B String
- Gauge: .136 in.; Tension: 34.83 lbs.
- G String
- Gauge: .043 in.; Tension: 37.03 lbs.
- E String
- Gauge: .100 in.; Tension: 34.39 lbs.
- A String
- Gauge: .070 in.; Tension: 31.30 lbs.
