Carlson's Choke Tubes are manufactured from corrosion resistant 17-4 PH Stainless Steel. Carlson's Extended Turkey Choke Tubes are designed for Lead, Copper and Lead combination, and Hevi-Shot shot. They feature a 25% longer parallel section which creates a denser pattern and reduces the occasional flier. Extended Turkey Choke Tubes extend approximately 1" from the end of the barrel and feature a 1.050" parallel section to produce the optimum pattern with your shotgun. Stainless Steel finish and backed with a lifetime warranty.