Detail 01
Cobalt alloy
More magnetically responsive than nickel-plated steel. Louder output, brighter top, more midrange bite through the pickup.
Product detailSKU #1321473138371
Ernie Ball2733 Cobalt Hybrid Slinky Electric Bass Strings
1/2
Independent shopping perspective
The Korena take
Cobalt-alloy bass strings in a hybrid gauge — heavier low strings, lighter top two. For 4-string players who want a tighter B-to-E feel without stiff plain strings.
Strong match
Who this is for
- Drop or down-tuned 4-string bass needing tighter low-end
- Pick players wanting more attack and output
- Slap tone with a bright, aggressive top end
Consider the trade-offs
When to look elsewhere
- 5-string basses — this is a 4-string set
- Players chasing warm, vintage thump
- Anyone sensitive to nickel-free alloy brightness
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
Hybrid Slinky gauge
Thicker E and A, thinner D and G. Firmer low-end tension with easier bends up top.
Detail 03
Electric bass set
Steel-core roundwound construction. Not for acoustic bass or upright, and rougher on frets than flatwounds.
Detail 04
4-string set
Four strings only. No low B or high C included for extended-range instruments.
Final check
Know before you order
- 01Check your bass takes long-scale strings before ordering
- 02Cobalt is brighter than nickel — expect a tone shift
- 03Roundwounds wear frets faster than flats over time
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Does cobalt feel different than regular Slinky strings?
The gauges match standard Hybrid Slinky, so tension feels the same. The difference is output and brightness — cobalt drives pickups harder with more upper-mid presence.
02Will these work for drop tuning?
The heavier E and A hold tension better when dropped a step than a straight light set. Hybrid gauging is built for exactly that.
03Are cobalt strings nickel-free?
Cobalt is a different alloy from nickel-plated steel. If nickel contact bothers your hands, this is worth trying.
04Do these fit a short-scale bass?
This is a standard electric bass set. Check your scale length and string-through routing before buying — short-scale instruments need shorter windings.
