Ernie Ball has teamed up with Metallica’s James Hetfield to launch his first-ever signature set of guitar strings, Papa Het’s Hardwired Master Cores. Papa Het’s new Hardwired Master Core set boasts of James’s “never-before-offered” 11-50 gauge combination – 11, 14, 18p, 28, 38, 50 – and comes in a green metal tin with custom artwork…