CARL CHOKE TUBE 12GA BEN CRIO FLUSH IC Made from 17-4 heat treated stainless steel, these chokes are for the Benelli Crio/Crio Plus system. Steel, Lead, & Hevi-Shot may be used in all constrictions with the exceptions listed below. No Steel shot larger than #BB or speeds exceeding 1550 fps should be used in choke tubes tighter than full. No steel shot allowed in our turkey constrictions These choke tubes are backed by Carlson's Lifetime Warranty and Made in the USA!