Maximum Range Turkey Choke Tube.Designed to increase the range and pattern density of your favorite turkey gun! The Jelly Head Maximum utilizes an extended taper and fluted ports to tighten patterns up to 20% and reduce recoil...allowing you to stop Gobblers in their tracks at even longer ranges!Primos utilize proprietary Black-T coating, the same protective barrier utilized by the military's Special Forces to prevent rust and corrosion on weapons in the harshest environments, like turkey hunting.