Dunlop Trivium Signature Guitar Strings, 7-String (.010–.063): the Heavy Core set on both Heafy's and Beaulieu's 7-strings, reviewed

Dunlop developed the Trivium Signature Guitar Strings with both of the band's guitarists at once, Matt Heafy and Corey Beaulieu, through its in-house String Lab process. The line released in September 2022 as a pair: a 6-string set and this 7-string companion. Per Premier Guitar's announcement of the partnership, every gauge in both sets was handpicked by the pair to hold a full dynamic range that stays stable when tuned down.

This 7-string set, TVMN10637, is not a separate design from the 6-string TVMN1052 reviewed on CYS's sibling page. It is the same straight, nickel wound "10's Heavy" progression, extended by one heavier string to cover the band's lowest material. Dunlop's own product page lists the gauges as 10, 14, 18, 30, 40, 52, and 63, described in-house as an "Electric, Nickel Wound, 10's Heavy, 7-String Set."

Both of Trivium's touring 7-strings run this exact SKU, not just one guitarist's. That is confirmed on record below.

Both guitarists are documented Dunlop artists, and this is their own signature product, so treat the quote as an endorsement rather than a neutral review. What makes it more than marketing copy is the Rig Rundown corroboration below: both players' actual 7-string stage guitars carry this exact set, not just the 6-strings the press release highlights.

Signature strings do not always end up on the artist's own guitar, and a signature line does not always mean every guitar in the lineup uses it. This one clears both bars, on both players' 7-strings, according to Premier Guitar's 2022 Rig Rundown with PG's Chris Kies:

• Corey Beaulieu's Jackson Custom Shop King KV7, a "blue bombshell" a Jackson rep delivered during the 2013 Mayhem Fest tour: a Custom Shop master builder built it off Beaulieu's standard King V signature specs, but swapped the usual AAA-flame maple cap for a quilted maple top, the only King V finished that way. For years it stayed home because it felt too special to tour; the band's last few tours have finally put it on the road as his main 7-string. It currently holds his then-unreleased signature Seymour Duncan Blackouts. Per the Rundown, it "takes the band's signature Dunlop TVMN10637 Heavy Core Trivium Strings (.010-.014-.018-.030-.040-.052-.063) and usually stays in B-flat tuning."
• Matt Heafy's Epiphone Matt Heafy Les Paul Custom Origins 7-String, nicknamed "Chugasaurus Rex," shares its body, neck profile, and Fishman MKH Fluence pickup pair with his 6-string signature, stretched to a longer 25.51-inch scale for the extra string. "As expected, this one takes Dunlop TVMN10637 Heavy Core Trivium strings" too, per the same Rundown.

That is two separately built, separately toured 7-string guitars, both strung with the identical retail SKU, on camera, not a press release assuming both players use the same gauge because they share a signature line.

A 7-string guitar already adds a low string below standard 6-string E. Tuning that whole instrument down another half-step, from standard 7-string B to B-flat, asks even more of the low end: the same logic that makes a straight .046 set go slack in Drop D on a 6-string applies here, just one string lower and one tuning step further down.

CYS's own B-standard tuning reference puts a .056 low string at roughly 14 lbs of tension at standard B pitch, its modern-default 7-string gauge, with .059 around 15 lbs (firm) and .062 around 17 lbs (stiff for standard B, more at home in Drop A). TVMN10637's .063 sits essentially at that heaviest end, but Beaulieu tunes his 7-string a half-step lower still, to B-flat, not standard B. That extra half-step down trims the tension back somewhat, so the real feel likely lands closer to the .059 entry's firm, mid-teens pounds than to a stiff .062-at-standard-B number. Dunlop doesn't publish its own tension figure for this set, so treat this as a reasoned estimate against CYS's own published range, not a manufacturer spec.

The plain strings on top (.010, .014, .018) stay identical to the 6-string set, so lead lines and pinch harmonics feel the same whether a player picks up the 6- or 7-string Epiphone or Jackson mid-set.

The lesson in that table: not every 7-string metal set is built for the same tuning or the same wrap material. Dunlop's straight nickel progression tops out heavier than either Ernie Ball Cobalt option, built specifically to hold B-flat, half a step below where Ernie Ball documents its own Cobalt 7-string range starting. If your 7-string material sits at standard B or in Drop A territory, the lighter Cobalt options are the closer documented match; if it drops to B-flat like Trivium's, TVMN10637's heavier low string is the one built for that pitch.

• B-flat 7-string rhythm players who want the exact gauge two working touring metal guitarists actually have strung on their main 7-strings, not a marketing approximation
• Metalcore, melodic death metal, and thrash players who want the same handpicked, tuning-stable low string both of Trivium's touring guitarists actually play
• Players who already own the 6-string TVMN1052 and want the matching 7-string half of the same line

• Standard 7-string B tuning without a gauge check first. A .063 low string is heavier than most stock 7-string factory sets; players in standard B rather than B-flat may find it stiffer than expected.
• Players who want a published tension chart. Dunlop does not publish one for this set; the reasoning above is CYS's own estimate against its published B-standard range, not a manufacturer figure.
• 6-string-only players. This is a 7-string-specific set; see the TVMN1052 companion for the 6-string half of the same line.

TVMN10637 is a genuine two-player signature set with the same rare distinction as its 6-string sibling: verifiably on both artists' actual touring 7-string guitars, not just their names on a Dunlop press release. If your 7-string material drops to B-flat and you want Trivium's own metalcore, melodic death metal, and thrash blend of tone held stable down there, this is a directly documented match. Buy the 6-string TVMN1052 instead if you only need the band's 6-string tone; this 7-string pack is built specifically for the lower-tuned material.