Ernie Ball has teamed up with James Hetfield for its latest artist signature string collaboration.

Papa Het’s Hardwired Master Core Signature Strings are now available through Metallica’s official web store.

Papa Het’s new Hardwired Master Core set consists of James’s unique never-before-offered 11-50-gauge combination, ideal for his aggressive style and technique.

The limited-edition signature sets come in a compact tin box with custom artwork designed by James.