Envision Engineering is a full service manufacturing company that specializes in the deep draw forming of sheet metal components. Products engineered and manufactured by Envision can be seen on several of the top OEM American made motorcycles, including after market fenders and covers for Harley Davidson. They also sell retail the shells as shown. Each side is approximately 25" long and has 6" of useable width. The tanks are constructed from 16 gauge steel with easy welding in mind. They are sold by the set, with a left and a right side shell. You can also order tank mounts, tunnels and inlet bungs. Envision Engineering.