Description
Flatwounds usually mean giving up some bite for that buttery feel — Ernie Ball’s Regular Slinky Flatwounds refuse to make that trade. This 5-string .045-.130 set wraps a SuperBright Cobalt ribbon around a Cobalt under-wrap, tuned to an optimized hex-core/wrap ratio so you get the glassy slide of traditional flats without losing the growl and top-end brightness that rounds are known for.
Cobalt itself is the real difference-maker here. It’s a modern alloy that responds to your pickup’s magnetic field more strongly than standard nickel or steel, which translates to higher output, a more dynamic sound, and strings that keep performing set after set. If you’ve noticed your tone going dull and lifeless before the strings even feel worn out, that’s exactly what Cobalt construction is built to prevent.
Where flatwounds usually shine — fretless basses, vintage-voiced tones, quieter finger noise — this set delivers all of that plus enough clarity and punch to sit well in a mix. Under the fingers they’re smooth and fast; through the amp they’re anything but flat-sounding.
- Gauges: .045, .065, .080, .100, .130 (5-string set)
- SuperBright Cobalt ribbon wrap over Cobalt under-wrap
- Optimized hex-core/wrap ratio for flatwound feel with rounds-like output
- Higher magnetic response for stronger pickup output and longer string life






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