Made from 17-4 heat treated stainless steel, these chokes are for the Beretta/Benelli Mobil shotguns. 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!