Jeff, I know their different but to the average shooter it doesnt make a real big difference. And it saves them a little money instead of going out and buying a new tube when cylinder is close enough for them to get the feel of it. Then later if needed, they can invest in a "skeet" choked tube. Joshua, For now, I would stick with the Imp.Cyl tube and you should be fine. And I got the fishing itch also im and headed to the shore tommorow to hit the surf for some Stripers.