Plain steel. 16" (40.6cm) long x 8.5" (21.6cm) wide x 7" (17.8cm) deep. Two shells required for one tank. Shell can be used for both left and right side. These are the exact same gas tank shells Paughco uses to produce their fuel tanks. Now you can do the same; and modify it in the manufacturing process at will; enabling you to build your own one-off gas tank; in a perfect design-balance with your bike. Note: Sold as shell only. Tank components as tunnel; gas cap bung; petcock bung and tank mounts must be purchased separately. Note: It is advised to pressure test; seal and test fit all tanks before tanks are painted and installed.