In preparation for their collaborative project Tracking Numbers, Berner and Young Dolph released the project's first single 'Knuckles'. With assistance from Gucci Mane on a guest verse, the Bay area and Atlanta rappers receptively do their thing over a warm pitched up vocal sample. The project will feature Wiz Khalifa, Gucci Mane, Juicy J, Project Pat, Pewee Longway & more, and is currently due out August 25th. While you have a few weeks to wait for that, you can listen to the new single now above.