These Choke Tubes feature Triple Shot Technology (TST), which is a series of three graduated rings in the taper section of the choke tube that allows a more gradual transition to the final constriction. This design offers reduced pellet deformation, less flyers and more dense patterns, make them extremely effective on all types of waterfowl throughout the entire season. The Cremator series has no size or speed restrictions with steel shot in any of the three constrictions. You also get all the benefits of an extended choke tube, including a 25% longer parallel section for tighter and more dense patterns, wrench-less installation, quick removal and helps with muzzle protection.