Very little dresses up a rig like bold shiny chrome semi truck stacks! These stacks are show quality with bright nickel chrome plating and hand-polished for a flawless and durable finish. They are 100% American made of cold rolled, Aluminum killed Carbon steel. Manufacturer warranty against product defects in workmanship and materials for one (1) year from date of purchase. Mitered finish top, 4" diameter straight stack with expanded and slotted bottom (to fit over elbow of same size) x 24" long. Clamps required (not included).