---
product_id: 3865113
title: "Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725)"
brand: "ernie ball"
price: "€ 23.47"
currency: EUR
in_stock: true
reviews_count: 8
category: "Ernie Ball"
url: https://www.desertcart.nl/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38
store_origin: NL
region: Netherlands
---

# Cobalt alloy boosts magnetic pickup response Extended dynamic range & harmonic clarity 8-38 gauge for ultra-light tension Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725)

**Brand:** ernie ball
**Price:** € 23.47
**Availability:** ✅ In Stock

## Summary

> 🎸 Elevate your tone, shred with ease, and never miss a beat!

## Quick Answers

- **What is this?** Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) by ernie ball
- **How much does it cost?** € 23.47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38)

## Best For

- ernie ball enthusiasts

## Why This Product

- Trusted ernie ball brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Playability:** Extra Slinky 8-38 gauge offers lightning-fast fretboard navigation with minimal finger fatigue—perfect for shredders and improvisers alike.
- • **Unmatched Magnetic Power:** Cobalt alloy creates the strongest pickup-string connection ever, delivering richer tone and louder output.
- • **Smooth Glide & Harmonic Bliss:** Ultra-smooth fret slides and enhanced harmonic response make every note sing, inspiring creativity and flawless expression.
- • **Premium American Craftsmanship:** Handmade in California with the freshest materials, ensuring consistent quality and durability for long-lasting performance.
- • **Crystal Clear Highs & Punchy Lows:** Experience a wide dynamic range with crisp highs and a powerful low end that cuts through any mix.

## Overview

Ernie Ball Extra Slinky Cobalt Electric Guitar Strings (8-38 gauge) feature a revolutionary cobalt alloy that maximizes magnetic pickup interaction for superior output and clarity. Designed for fast playability with extra light tension, these strings deliver an extended dynamic range, crisp highs, and strong lows. Made in California with premium materials, they offer durability and smooth fretboard feel favored by professional guitarists worldwide.

## Description

Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky guitar strings are one of the latest innovations in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available.

Review: Just get em - I’ve been a guitarist since 1979 , ive been through A LOT of guitar strings. I put a set of these onto a cobra blue Ultra stratocaster HSS and they performed ( are still performing) FLAWLESSLY! Serious bends when playing leads don’t break them , they sound & feel fantastic, keep perfect tuning well and seem to last a very very long time with Awesome Harmonics . Also if 10s are a little thick but 9s are TOO thin , these 9.5s may be exactly perfect for you . I’ll definitely be getting more of these cobalt slinkys in 9.5-44
Review: Sound amazing and feel amazing - I was very scheptical of what these would sound like compared to the hybrid set on my Ibanez, I have A Dimarzio Super Distortion at the neck and a Dimarzio Pro Track in the middle and a Dimarzio x2n at the bridge and the hybrid set sounded good but did have that extra part that was missing in the articulation of heavy riffs and stuff and some of the low end was more muddy sounding and seemed to feel a little off when you set the action and so forth, so i tried out these extra slinky and these blow my mind, its like it still does that low end but it has that extra articulation now with that low notes you get, its insane, and alot easier to pull of pinch harmonics and riffs, ultra smooth fret slides, i am super picky on the guitar, i have my frets polished at 12000 mirror like finish and these just glide so smooth on the frets. If you are ultra scheptical about what strings to get and see so many out there and I am glad i found these as these seem more than good enough for me, now it makes me too addicted to Improv playing again with drum beat in background then playing pc games and stuff :)

## Features

- Cobalt produces a stronger magnetic relationship between pickups and strings than any other alloy previously available
- Cobalt electric guitar strings provide an extended dynamic range, incredible harmonic response, strong low end, and crisp, clear highs
- Wound strings consist of Ernie Ball’s Cobalt alloy wrapped around a tin-plated high-carbon steel core wire
- Extra Slinky brings extra light tension for fast and easy play across the fretboard
- Made in California, USA with the finest and freshest materials

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007NCVWNW |
| Best Sellers Rank | #404 in Musical Instruments ( See Top 100 in Musical Instruments ) #8 in Electric Guitar Strings |
| Brand | Ernie Ball |
| Brand Name | Ernie Ball |
| Coating Description | Cobalt |
| Color | Extra (8-38) |
| Customer Reviews | 4.7 out of 5 stars 9,875 Reviews |
| Finish Type | Uncoated |
| Global Trade Identification Number | 00749699127253 |
| Instrument | Electric Guitar |
| Item Type Name | Electric Guitar Strings |
| Item Weight | 18.14 g |
| Manufacturer | Ernie Ball Music Man |
| Material Type | Cobalt |
| Model Name | Extra Slinky |
| Model Number | P02725 |
| Recommended Uses For Product | Electric Guitar |
| String Gauge | .008 |
| String Material Type | Cobalt |
| UPC | 749699127253 |
| Unit Count | 1.0 Count |
| Warranty Description | None. |

## Product Details

- **Brand:** Ernie Ball
- **Color:** Extra (8-38)
- **Instrument:** Electric Guitar
- **String Gauge:** .008
- **String Material Type:** Cobalt

## Images

![Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) - Image 1](https://m.media-amazon.com/images/I/81UTEdg5WJL.jpg)

## Available Options

This product comes in different **Color, Size, Style** options.

## Questions & Answers

**Q: Are these made from cobalt mined by dwarves in the mines of Moria? Someone on the internets said so.**
A: Now we know why ErnieBall cobalt strings make most magical sound vibrations 🎶mines of Moria, dwarves & elvin magic ✨

**Q: Are they better for finger-picking?**
A: I installed these strings on a 72 fender telecaster thinline with wide range pickups using a fender supersonic 60 watt tube amp and found the sound difference from the Ernie ball super slinky strings I usually use to be harsh. There was more treble then I wanted and an almost chimey sound from the higher notes. This is not a string suited for country music which is what I was playing. It accents the finger picking well by making each individual note stand out more clearly but the louder I played it started distorting and under distortion it was an unpleasant sound. Best stick to the tried and true Ernie ball slinky and super slinky for finger picking. In fact on my american start with single coils the slinky strings sound the best by far for country music. Tuffet to bend then super slinky but a much more rounded tonal quality then these cobalt strings. I hope this review helps.

**Q: are these strings round wound or flat wound?**
A: Strings are round wound.

**Q: Are the 3-packs individually wrapped packages that can be sold separately? Or is it 3 sets of strings in one package?**
A: The 3-packs come in one package, but you can separate them once you open up the package.If this was helpful, please consider purchasing from us. We can help with support after the sale as well. We have it in stock and ready to ship. - Pixel Pro Audio

## Customer Reviews

### ⭐⭐⭐⭐⭐ Just get em
*by S***N on December 5, 2025*

I’ve been a guitarist since 1979 , ive been through A LOT of guitar strings. I put a set of these onto a cobra blue Ultra stratocaster HSS and they performed ( are still performing) FLAWLESSLY! Serious bends when playing leads don’t break them , they sound & feel fantastic, keep perfect tuning well and seem to last a very very long time with Awesome Harmonics . Also if 10s are a little thick but 9s are TOO thin , these 9.5s may be exactly perfect for you . I’ll definitely be getting more of these cobalt slinkys in 9.5-44

### ⭐⭐⭐⭐⭐ Sound amazing and feel amazing
*by T***Y on November 7, 2025*

I was very scheptical of what these would sound like compared to the hybrid set on my Ibanez, I have A Dimarzio Super Distortion at the neck and a Dimarzio Pro Track in the middle and a Dimarzio x2n at the bridge and the hybrid set sounded good but did have that extra part that was missing in the articulation of heavy riffs and stuff and some of the low end was more muddy sounding and seemed to feel a little off when you set the action and so forth, so i tried out these extra slinky and these blow my mind, its like it still does that low end but it has that extra articulation now with that low notes you get, its insane, and alot easier to pull of pinch harmonics and riffs, ultra smooth fret slides, i am super picky on the guitar, i have my frets polished at 12000 mirror like finish and these just glide so smooth on the frets. If you are ultra scheptical about what strings to get and see so many out there and I am glad i found these as these seem more than good enough for me, now it makes me too addicted to Improv playing again with drum beat in background then playing pc games and stuff :)

### ⭐⭐⭐⭐⭐ Awesome Strings for Metal.
*by B***Q on December 23, 2025*

These strings are pretty good for the music I play. This is the reason I gave five stars. For Heavy Metal, Modern Rock, Classic Rock, or pretty much anything using distortion, these cobalt strings are great. My only regret is that I should have gotten a larger diameter set. I normally run this size string with other types, but the fatter ones using cobalt definitely sound like they rip. I have no complaints and this size, though. They still sound great. The only thing I noticed was there seems to be a little more fret buzz, but an adjustment would fix that. You cannot hear it through an amplifier, though. When playing clean tones, these things are super bright sounding. Not bad, but I like regular material better. Metal, I don't think you can go wrong.

## Frequently Bought Together

- Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725)
- Ernie Ball Zippy Slinky Nickel Wound Electric Guitar Strings, 7-36 Gauge (P02217)
- Ernie Ball Extra Slinky Coated Titanium Electric Guitar Strings, 8-38 Gauge (P03125)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-26*