Wilson Combat UltimaLube II is blend of petroleum and synthetic lubricants specially formulated to insure optimal performance of any firearm and inhibit wear. The unique blend of lubricating fluids has proven ideal for todays hightech semiauto weapons whether manufactured of conventional steels aluminum alloys or stainless steel. In addition Wilson Combat has found nothing superior to UltimaLube II for the proper lubrication and protection of the handfit custom firearms that Wilson Combat is known for.