The steel is separated from the other materials by a magnet that sits above the sort line. If you look closely, you can see the two cans that have been grabbed off the line by the magnet. The magnet rotates from left to right and drops the steel cans into a bin on the right. You can also see the aluminum cans that remain on the line. Aluminum is not magnetic, so it travels beneath the magnet and is not picked up. >> Next >>