Pricing and availability

We compare 600+ stores and found this item at 5 stores. Prices updated .

Sweetwater
4.0 (15)
$49.99
Guitar Center
4.0 (18)
$49.99 $49.85 $0.14 · All time low
Amazon
4.7 (2493)
$49.85
Musician's Friend
5.0 (4)
$49.99 $49.85 $0.14 · All time low

Price History

Based on price data from 4 merchants for "Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105)". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

Unlock the perfect blend of comfort and power with the Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105). These strings bring together the silky feel of traditional flatwounds with the dynamic output of Cobalt, offering a playing experience that’s both smooth and sonically bold. Designed for bassists who crave the best of both worlds, these strings deliver the incredible comfort of flats while producing the vibrant tones typically associated with roundwounds.

The innovative SuperBright Cobalt ribbon wrap and Cobalt underwrap provide a superior magnetic response, ensuring your pickups capture every nuance of your performance with enhanced clarity and output. The proprietary alloy blend attracts your pickups' magnets more effectively than any other alloy, delivering higher output and a richer tonal palette. With an optimized hex-core to wrap ratio, these strings offer balanced tension, making it effortless to play fast passages, whether you're plucking or picking.

Perfect for both fretted and fretless basses, these strings yield robust lows with added definition, focused mids, and crisp highs. Enjoy improved harmonics and sustain that breathe new life into your sound, all while benefitting from strings that last longer than conventional options. Elevate your bass guitar's performance and explore new sonic territories with Ernie Ball's groundbreaking flatwound strings.

Key Features:

  • Gauges: .045, .065, .085, .105
  • SuperBright Cobalt ribbon wrap for superior sheen and feel
  • Cobalt underwraps for enhanced clarity and output
  • Optimized hex-core/wrap ratio for comfortable tension and playability
  • Higher output and longer string life than conventional strings
  • Rich tonal spectrum with defined lows, focused mids, and crisp highs

Product specs

Guitar Type Electric Bass
Number of Strings 4
Coated No
Gauges .045, .065, .085, .105
Winding Type Flat Wound
Core Material Hexagonal Steel
Winding Material Iron/Cobalt Alloy
Scale Length Long

FAQs

What are the tonal characteristics of Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings?

These strings provide a smooth, warm tone typical of flatwounds, with added brightness and clarity due to the cobalt alloy, making them versatile for various music genres.

Are Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings suitable for all bass guitars?

These strings are designed for long-scale electric bass guitars and fit most standard basses, but it's important to check your bass's scale length compatibility.

How do Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings compare to roundwound strings in terms of feel?

Flatwound strings, like these, offer a smoother feel and less finger noise compared to roundwounds, making them comfortable for extended playing sessions.

Do Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings maintain tuning stability well?

Yes, they feature a hexagonal steel core that provides excellent tuning stability, ensuring consistent performance during play.

Are these strings easy to install on my bass guitar?

Yes, Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings are straightforward to install, similar to other string types, requiring no special tools or techniques.

Oliver Tobyn

Oliver Tobyn

Do they sound like roundwound strings? | Ernie Ball Cobalt Flatwound

Video thumbnail for Do they sound like roundwound strings? | Ernie Ball Cobalt Flatwound by Oliver Tobyn

Do they sound like roundwound strings? | Ernie Ball Cobalt Flatwound

Oliver Tobyn

Oliver Tobyn

Video thumbnail for Why I switched to Ernie Ball Slinky Cobalt  Flatwound Bass Strings by Searcy String Works

Why I switched to Ernie Ball Slinky Cobalt Flatwound Bass Strings

Searcy String Works

Searcy String Works

Reviews

PROS

  • Mellow tone even beyond the 12th fret, ideal for contemporary music

  • Midrange pop for funky tones without fret noise

  • Smooth feel similar to rotosound jazz bass, but better sound

  • Easy to string, fits various bass scales well

  • Unique, bright sound with upper register harmonics

  • Versatile for different music styles, from rock to surf/punk

  • Comfortable tension, not stiff, feels great on fingertips

  • Bright with thump and body, improving as they age

  • High midrange tone, unmatched by other strings

  • Consistent quality with no defective strings in multiple purchases

CONS

  • Strings come with an oily coating, requires cleaning

  • May become sticky during gigs, needing frequent wipes

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105).

Build quality

  • Some sets exhibit rough and uneven texture due to gaps in winding, impacting smoothness and feel.

    Source

Comparisons

  • Compared to D'Addario Chromes, Ernie Ball Cobalts are brighter but more prone to rust.

    Source
  • Players switching from steel rounds to lighter gauge cobalt flats report less grip and improved thump while retaining top-end clarity.

    Source

User experience

  • Users report strings rusting quickly after outdoor gigs or humid environments.

    Source
  • Cobalts are perceived as a hybrid sound, offering brightness close to roundwounds with the smoothness of flatwounds.

    Source
  • Some owners report receiving new strings with rust spots or breaking during installation, pointing to potential quality control issues.

    Source
  • Cobalt flats have a hybrid tone, combining low-end "slam" with a grindy treble, which may fade over time to resemble traditional flats.

    Source
  • Flats provide more articulation on short-scale basses, maintaining brightness without sacrificing the traditional flatwound feel.

    Source
  • Some players report premature string breakage, potentially due to corrosion within the core wire, not just surface rust.

    Source

Setup and maintenance

  • Corrosion can occur quickly, even with regular cleaning, especially on budget instruments with lower-quality fret materials.

    Source

Use cases and applications

  • Cobalt flats are appreciated for modern tones on passive jazz basses, offering brightness and clarity in recordings.

    Source

5.0 out of 5

Based on 0 Reviews and 2 Ratings

5 star
4 star
3 star
2 star
1 star

Artist usage

Add artist
See how Paul Hinojos uses Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105)

Paul Hinojos

Bassist

At the Drive-In

...
Verified via Photo

During the At The Drive-In reunion, Paul Hinojos was confirmed to use Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105), as indicated by the distinctive purple silk at both string ends and the yellow ball ends characteristic of Ernie Ball Cobalt Flatwound strings, visible in the source image.

See how Benny Rietveld uses Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105)

Benny Rietveld

Bassist

Santana

...
Verified via BassPlayer.com

In an interview with BassPlayer.com, Benny Rietveld discusses his use of Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105) while performing with Santana.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Ernie Ball Hybrid Slinky Cobalt Flatwound Bass Strings (45-105), it is most commonly used with the following gear.

Grace Design M103
Grace Design M103 Preamps & Channel Strips
1
QSC PLX3602
QSC PLX3602 Power Amplifiers
1
Fender HiMass Bass Bridge
Fender HiMass Bass Bridge Guitar Bridges and Tailpieces
1
Aguilar DB 410
Aguilar DB 410 Bass Amplifier Cabinets
1

Community setups

Show yours
vagen

vagen

Gear IQ 614

More Ernie Ball Strings

Accessories & Related Items

Similar

Gear Guides