GHS Bass Boomers Flea Signature M3045-F (.045–.105): the RHCP signature roundwound
Reviewed by the Change Your Strings editorial team ·
GHS Bass Boomers M3045-F is the Flea-signature 4-string bass roundwound set. Nickel-plated steel on hex core, long-scale, .045 to .105. The standard Boomers gauge with Flea's name on the package, sold and stocked as a signature SKU on the GHS roster page. Same family as the workhorse M3045 Boomers, with packaging and identity tied to the Red Hot Chili Peppers low end. Pick this set when you want the slap-friendly attack and steady fingerstyle pocket Flea uses across Stadium Arcadium, Californication, and the band's recent catalog.
Anatomy
Why this is the funk-rock default
Tone
The M3045-F sounds like the canonical slap-funk roundwound: bright but not piercing, harmonically rich on the snap, mid-range punch that locks into a drum kit's kick and snare without fighting. The signature gauge is the medium standard, .045 to .105, which is the gauge most working bassists would choose for a versatile set across funk, rock, and slap technique.
Compared to the other Tier-1 bass roundwound sets:
Best for
- Funk and slap-driven rock where the bass carries the harmonic weight under a vocal-forward mix (Flea's lane on the Red Hot Chili Peppers catalog).
- Alternative rock with melodic bass lines that need both slap pop and fingerstyle pocket without changing strings between songs.
- Players who want a slap-friendly nickel-plated set without stepping to brighter stainless rounds.
Worst for
- Vintage Motown or jazz fingerstyle where you need flatwound thump (use La Bella Deep Talkin' Flats).
- Aggressive metal or prog where you want the upper-harmonic content stainless rounds provide (use Rotosound 66).
- Players who prefer a darker, more compressed feel under a pick (use Fender 7250 for that lane).
Who plays them
- Flea (Red Hot Chili Peppers): documented signature artist on the GHS roster page, the M3045-F is the production SKU built around his standard gauge. See the Flea rig page for full sourcing.
- Working session bassists who track funk, alt-rock, and pop sessions from a single set without changing strings between sessions.
- Slap-technique players at every level from beginner to working pro; the Boomers wind gives the snap and pop slap players want without specialty tension.
Install and break-in
- Set the bass on a neck rest or padded surface. Loosen all strings evenly before removing.
- Wipe the fretboard with a dry cloth.
- Install top-down (E first, then A, D, G). Leave 2 to 3 wraps per tuning post.
- Bass strings need more stretching than guitar strings. Tune, push down hard at the 12th fret to stretch, retune. Repeat 5 to 8 times per string before they hold.
- Break-in: 1 to 2 hours of playing before the set settles into its working brightness. Slap players will feel the wind soften slightly across the first session.
Verdict
The M3045-F is the slap-funk equivalent of the universal-default bass roundwound: the signature pack with Flea's name on it, but tonally identical to the workhorse M3045 standard pack at the same price. If you want the Red Hot Chili Peppers low-end voicing on your bass, this is the answer. If you want a brighter or warmer set, see the comparison row above and step to Rotosound or Fender respectively.
Related
- The bassist on this set: Flea, Red Hot Chili Peppers' bassist since 1983.
- Brighter alternative: Rotosound Swing Bass 66 review.
- Same-gauge stock-Fender alternative: Fender Super 7250 Bass review.
- Vintage flatwound alternative: La Bella 760FL Deep Talkin' Flats review.