This invention is about creating a co-extruded bi-metallic tubes where two distinct properties are required at the outer and inner part of a tube in a single step and with a minimal billet preparation. Co-extrusion of 6061 (shell) and 7075 (core), 1100 (shell) and 7075 (core), and 1100 (shell) and 2024 (core) Al alloys were completed and a sound bonding at the interface was noted. Furthermore, thickness of the sleeve and core can be controlled via the area ratio of the constituent billet material.