Carlson's TSS Turkey Choke Tubes are optimized for Federal Premium Heavyweight TSS Turkey Loads but also work exceptionally well with other manufacturer's turkey ammunition (Smaller shot size 7-9). The Federal Premium's Heavyweight TSS Turkey Load has an incredibly high pellet count in both 7 and 9 shot, along with the ability to carry energy further, makes them ideal for .410, 20ga, and 12ga.Specifications and Features: Carlsons Choke Tubes are made in the U.S.A., carry a lifetime warranty and are precision-machined from heat-treated 17-4 stainless steel.