Carlsons' Waterfowl Extended Choke Tubes are manufactured from 1704 stainless steel and designed to throw tighter and denser patterns than conventional choke tubes. These choke tubes feature a 25 percent longer parallel section in the choke, thus throwing more consistent patterns. Each choke tube is knurled on the end to allow for quick and easy removal and the constriction and size laser marked on the end and body for easy reference. Steel shot may be used through these choke tubes with exceptional results. This model features three choke tubes (close range, mid range and long range) all with a black finish. A case is included. NOTE: Do not shoot steel shot larger than BB or any steel load faster than 1550 FPS through the full or extra full constriction.