These flush mount choke tubes are for the Benelli Crio/Crio Plus system and made from 17-4 heat treated stainless steel. Steel Lead and Hevi-Shot may be used in all constrictions with the exceptions listed below. These choke tubes are backed by Carlson's Lifetime Warranty and are made in the USA!
No steel shot larger than BB or speeds exceeding 1550 fps should be used in choke tubes tighter than Full
Steel shot should not be used in the turkey constrictions