Description
Seven strings, one job: hold their tuning and keep tone tight when you’re dropping into low territory. Dunlop’s Heavy Core set (M6) runs 10-60, giving you a slinky feel on the high strings while the wound low end stays defined instead of turning to mush under distortion or extended riffing.
Dunlop didn’t just scale up a standard set to get here. These strings were built from scratch at their Benicia, California facility, where formulas get shaped by feedback from touring players actually pushing gear night after night. The plant runs smaller batches at a slower pace on purpose — more hands-on control at every stage means the tension and response you feel on string one matches what you get on string seven.
- Gauges: 10-60 (M6 Heavy Core set)
- 7-string configuration
- Small-batch production for tighter quality control
- Sealed in a protective bag to lock in freshness before you ever open the pack
If you’re the type who swaps strings often — and if you’re shopping StringRush, you probably are — you already know a dead set on a 7-string kills the low B before anything else. Fresh Heavy Core strings bring back the growl and the snap, so palm mutes chug instead of thud and chords ring instead of clank. Keep a spare set in your gig bag; you’ll notice the difference the moment you plug in.





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