5.5 ft tire tank livestock tank 16 inch deep aluminum bottom with 31 galvanized bolts washers lock washers and nuts. Sealed using polyurethane same stuff that seals your windshield. Side walls is 1.5 inch thick rubber so stupid animal proof. Have had cows standing in tanks like this with no issues. Tanks built like this last for a very long time. Call Matt @ two53 three47 three802