“Brainbox” features Drapht, an Aussie emcee they’d previously collaborated with (notably on their The Hard Road track “The Blue Blooded”) and consider a good friend.

Suffa’s verse was originally featured on the 2012 Golden Era Mixtape under the title “Brainbox (Remix)”, with the verse at the time intended to feature on Headlock’s album, however due to reasons Suffa details below, this never eventuated.