...The buying and selling of metal scrap has been in practice since ancient times and today has become a multi-billion-dollar business. Machinery outlets, manufacturers, the government and various industries contribute to the collection of metal scraps. Metal scrap includes various forms of aluminum, including cans, used pipe, automobiles, appliances, sheet metal buildings, pots, computer components, pans, bicycles, lawn furniture, copper wire, obsolete equipment, old structural steel building frames, tin cans, and so on...