Model VSI and IVSI are available in eighteen sizes, from 5″ I.D. to 48″ I.D. Fittings include various elbows, tees, supports and terminations, as well as a variety of accessory fittings designed to make installation simple and quick. Each component is shipped complete and ready for installation. Each ordered part includes Inner Vee Bands, Outer Channel Bands and all the necessary hardware. Please visit http://www.ampcostacks.com/ for more information.