Kicks Gobblin' Thunder Turkey Chokes -With the right combination of shell, pellet & choke constriction, Gobblin' Thunder dependably delivers a 14 - 16" pattern at 40 yards. While constrictions are available for a variety of shell and pellet size combinations, we recommend a 3" #5 for best overall results.Gobblin' Thunder chokes are recommended based on shell and pellet size. Refer to the recommendation chart to determine which constriction size will work best for you. Because the recommendations are specific to the bore size of the barrel, recommendation charts are located on the product detail page Extended ported section fro faster and more accurate Precision machined17-4 PH grade stainless steelUnique conical/parallel internal design Exclusive outward angled diagonal pots Improve pattern density by up to 20%