Rex Brown's bass strings: the Pantera rig, sourced

Rex Robert Brown (born July 27, 1964, in Graham, Texas) has been Pantera's bassist since 1982, when he joined the Arlington, Texas band as "Rex Rocker," the alias he was credited under on the band's first four albums. He met future bandmates Dimebag Darrell and Vinnie Paul in high school, playing alongside Vinnie Paul in their school jazz band; that friendship became the rhythm section that anchored Pantera's entire catalog. Phil Anselmo joined as vocalist in 1986, and the classic lineup broke through with 1990's Cowboys from Hell, followed by Vulgar Display of Power (1992), Far Beyond Driven (1994, the heaviest album ever to debut at No. 1 on the Billboard 200), The Great Southern Trendkill (1996), and Reinventing the Steel (2000).

Pantera went on hiatus in 2001 and formally disbanded in 2003. Brown spent the 2000s in Down alongside Anselmo, recording Down II: A Bustle in Your Hedgerow (2002) and Down III: Over the Under (2007), then later formed Kill Devil Hill with former Black Sabbath and Dio drummer Vinny Appice. He released his debut solo album, Smoke on This..., in 2017, playing bass, guitar, and lead vocals for the first time in his career.

Dimebag Darrell was murdered onstage in 2004, and Vinnie Paul died of coronary artery disease in 2018. In July 2022, Brown and Anselmo announced Pantera's first tour in 22 years, with Zakk Wylde and Anthrax's Charlie Benante filling in for the Abbott brothers. The reunited band went on to open for Metallica across the multi-year M72 World Tour and continues to headline its own runs, including 2025's The Heaviest Tour of the Summer. As of the 2022 reunion, Brown is Pantera's longest-serving member.

Brown's current setup centers on two Gibson-family Thunderbirds strung with Ernie Ball 2733 Hybrid Slinky Cobalt Bass, .045 to .105. His Gibson Rex Brown Signature Thunderbird, released in 2022, is a mahogany-bodied 4-string with Rexbucker Thunderbird humbuckers (swapped for active EMG X pickups on his touring instruments) and a Hipshot Mini-Clover tuner set that includes a Drop D Xtender. Premier Guitar's 2024 Rig Rundown confirms the string gauge directly, and Gibson's own spec sheet for the bass lists the identical .045/.065/.085/.105 set.

Alongside the Thunderbirds, Brown still tours with two Spector basses: a 2008 Euro 4 he calls "Mother Glory," darkened over the years from its original white finish and finished with gold hardware, and a 2023 USA NS-5 five-string whose sound he says he can't beat. The NS-5 takes a heavier Ernie Ball 5-String Slinky Cobalt Bass set, .45 to .130, to handle its added low B string. Everything runs through an Ampeg SVT-4 Pro head into custom Mesa/Boogie 8x10 cabinets.

Ernie Ball

Hybrid Slinky Cobalt Bass (.045-.105)

.045 – .105

Price tier: $$

Why this one: Rex Brown's own documented Pantera gauge: cobalt-alloy output and low-end bump on a standard .045 to .105 4-string bass set.

E Standard (4-string)Eb Standard (4-string)Metal

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Rex Brown's Gibson relationship is a documented, manufacturer-confirmed endorsement. Gibson's own product page introduces "a new signature bass model from Rex Brown" built to his spec, complete with his signature reproduced on the truss rod cover and a hand-drawn doodle on the backplate. Epiphone's companion signature model is the same tier of relationship: a budget-friendly version of the same design, currently available from retailers.

His Ernie Ball string use is documented from multiple directions. Premier Guitar's 2024 Rig Rundown states plainly that his Thunderbirds "ride with Ernie Ball 2733 Hybrid Slinky Cobalt Electric Bass strings," and Gibson's own spec sheet for the signature bass lists the identical .045/.065/.085/.105 gauge independently. Ernie Ball's own site features him, too. Its String Theory artist series names him "Ernie Ball artist Rex Brown." He says on record that Cobalt strings are "the most consistent that I played in quite a while." CYS hasn't found public terms confirming a paid sponsorship deal. This page keeps the strings at verified use: real, sourced, and now confirmed by three independent parties, but not a documented formal contract.

Spector is a longer, historical relationship. Per Wikipedia, Brown "eventually endorsed Spector bass guitars," and Stuart Spector built him a custom RXT prototype in 2011. He sold that specific bass in 2019 along with a batch of other studio and stage gear, but Premier Guitar's 2024 Rig Rundown shows he's still touring with two different Spectors today: the 2008 Euro 4 and the 2023 USA NS-5. The brand relationship has clearly outlasted any one instrument.

Groove metal at Pantera's tempo and gain level needs low end that stays defined under a wall of downtuned, palm-muted guitar. Cobalt's selling point, a stronger magnetic relationship with a pickup than nickel-plated steel, matters most through an active pickup like the EMG X set on Brown's touring Thunderbird: more output and a tighter low end at the same gauge, so the bass line doesn't get buried under a stack of 4x12s.

The Gibson signature's built-in Drop D Xtender is a practical touch for the same reason: bassists in bands where the guitar drops tuning mid-set often want a fast way to drop their low string to Drop D without retuning by ear. It's a hardware feature aimed squarely at that scenario, whether or not it gets used on any single song.

The two-Thunderbird, two-Spector split also tells its own story. The Thunderbirds are the modern touring rig: EMG-loaded, Cobalt-strung, built around Brown's own signature spec. The Spectors are the older, road-worn instruments he keeps coming back to anyway, proof that a bass earns its place in a rig by feel over time, not just by being the newest signature model.

Rex Brown Approved

Ernie Ball

Hybrid Slinky Cobalt Bass (.045-.105)

.045 – .105

Price tier: $$

Why this one: Rex Brown's documented Pantera gauge on both Thunderbirds: cobalt-alloy output and low-end bump on a standard .045 to .105 4-string bass set.

E Standard (4-string)Eb Standard (4-string)Metal

View on AmazonFull review →

Bottom line: the strings are the affordable way into this rig. The Gibson signature Thunderbird is discontinued, but the Epiphone version and the same Cobalt string set are both still buyable today.