Description
Flats are supposed to feel buttery and sound warm — but sometimes you want them to talk back a little. Ernie Ball built the Regular Slinky Flatwound set around a Cobalt alloy formulation that grips your pickups’ magnets harder than traditional flatwound materials, so you get more output and more clarity without giving up that silky, tape-wound-style playing surface fretting-hand players and upright-leaning players love.
The construction is what makes this set different from a standard flat. A SuperBright Cobalt ribbon wrap sits over a Cobalt under-wrap, all tuned around an optimized hex-core-to-wrap ratio. The result is a string that rolls smoothly under your fingers like a classic flat but opens up with some of the brightness and growl you’d expect from rounds — useful when you’re moving between a mellow Motown pocket and a line that needs to cut through a busy mix.
This is the .045-.130 5-string gauge set, sized for players running a low B and wanting consistent tension and feel across all five strings without the fret noise or finger squeak rounds tend to bring.
- Gauges: .045, .065, .085, .105, .130
- Flatwound construction with Cobalt alloy for higher output and extended string life
- SuperBright Cobalt ribbon wrap over Cobalt under-wrap
- Optimized hex-core/wrap ratio for smooth feel with added brightness
- Built for 5-string basses tuned with a low B
If your hands are tired of round-wound zing but your ears still want presence, this set is worth a try on your next restring.







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