Practically nothing dresses up a rig like big shiny chrome semi truck stacks! These stacks are show quality with bright nickel chrome plating and hand-polished for a flawless and durable finish. The turn-out top directs exhaust away from trailer and also reduces rain water build-up. They are 100% American made of cold rolled, Aluminum killed Carbon steel. Plain end bottom. Manufacturer warranty against product defects in workmanship and materials for one (1) year from date of purchase. Clamps required (not included).