In an unusual rap pairing, Mac Miller has teamed up with Rick Ross for the majestic trap banger 'Insomniak.' The song is from Mac Miller’s just-released mixtape, 'Faces.'

On the Big Jerm-produced track, the Pittsburg rhymer brags about collecting paper while dropping Drake-inspired zingers.

"I’m on my worst behavior / Bad side piece with the perfect flavor / Motherf---ers never loved us / Comin' for your money, motherf---er, don't trust us,"he raps.

His partner-in-rhyme Ricky Rozay also delivers some gritty bars and a couple of punchlines.

He spits, "Pants sag, Jimmy Fallon / Blowin' green in the green room / Def Jam like Bawse really wildin'/ Yeah they hate but won't box a n---- / Bought an estate from a boxin' n---- / Paranoid, I'm walkin' 'round / I'm butt naked with my chopper, n----."

Mac Miller's 'Faces' mixtape boasts 24 head-nodding songs with guest appearances from ScHoolboy Q, Sir Michael Rocks, Earl Sweatshirt, Ab-Soul, Vince Staples and Mike Jones (Who? Yes, that Mike Jones!). Among the standout tracks: 'Here We Go,' 'Angel Dust,' 'Therapy' and 'Diablo.'

In addition to his mixtape, Miller has partnered with Diamond Supply Co. to release an apparel capsule dubbed "Old Jewish Diamonds." The collection, which pays homage to Miller's Jewish roots, features three T-shirts and a hoodie. You can cop his gear here.

If you want to download Mac Miller's mixtape 'Faces,' click this.

Listen to Mac Miller's Song 'Insomniak' Feat. Rick Ross