Aftermarket Sportster style gas tank. Aside from the surface rust. Gas tank was in sound condition. We stripped the outside using a combination of dry and wet blasting. For the inside. We tumbled the gas tank with a combination of stainless steel and silicon carbide to remove all the rust. After tumbling. The inside of the gas tank looks just as good as the outside. We will make a separate post showing before and after pictures of the inside.