Co-developed with Metallica’s James Hetfield over the past decade, Ernie Ball 2201 Papa Het’s Hardwired Master Cores signature electric guitar strings deliver the thicker tone, pitch stability and durability required by his aggressive playing style. This set features Hetfield’s preferred 11–50 gauge combination and a heavier core-to-wrap ratio for increased tension and a more focused attack. Wound strings use thicker Paradigm core wire wrapped in nickel-plated steel around ultrahigh-strength tin-plated steel hex cores, helping maintain clarity and tuning stability under heavy picking. The plain strings use Paradigm core wire with brass RPS reinforcement at the ball end for added strength and improved tuning stability. Designed for players who want the tight low end and solid feel favored by James himself, Papa Het’s Hardwired Master Cores strings offer road-ready durability and powerful response for modern rock and metal playing.