The Patternmaster Code Black Goose tube was designed around a 3½" shotshell wad to give those hunters who demand the most out of their equipment just what they need. This product will give you a Full pattern with an effective range up to 70 Yards. Want a more open pattern? Dropping pellet size will allow your pattern to open up more, just as increasing your pellet size will tighten it. All Patternmaster Code Black tubes are crafted from American made, Titanium Nitride coated 17-4 aircraft quality stainless-steel and are heat treated to the optimum level for best performance and are safe and effective with Lead, Steel, and other Non-Toxic shot including TSS. These tubes are ported to reduce recoil.