The Carlson's TSS Turkey Choke Tube are specifically designed for turkey hunting with Federal Premium Heavyweight TSS turkey loads, using tungsten shot; though also work well with other manufacturer's turkey loads. Carlson's TSS choke tubes are made of 17-4 stainless steel with a matte black finish, and have a knurled, extended end to facilitate installation and removal. The TSS Turkey Choke Tube delivers devastating patterns, capable of deadly headshots on turkey out to 50 yards. (Not for use with steel shot.)