Aluminum is a lightweight, silvery-gray and highly malleable metal. It was first extracted in the early 1800s but its extraction process made it rare. Breakthroughs in the late 1800s made aluminum more abundant. Aluminum is traded on the MCX, with a contract size of 5 MT and delivery in 5000 kg units. Key factors that affect aluminum prices are Chinese production and demand, global inventory levels, and demand from the transportation and construction industries.