Carlson's Choke Tubes 11605 Cremator Crio/Crio Plus Benelli 12 Gauge Mid-Range Non-Ported 17-4 Stainless SteelCarlson's Cremator Choke Tubes feature Triple Shot Technology (TST) and is offered in close, mid, and long range constrictions. TST is a series of three graduated rings in the taper section of the choke tube that allows a more gradual transition from the shotgun bore to the final constriction. This design offers reduced pellet deformation, fewer flyers, and more dense patterns. These benefits make the Cremator Series extremely effective on all types