Sorry about the simple question guys, but I didnt know where else to start looking. I was wondering what the difference is in shafts. This will be my first year bowhunting, and my Dad and I will be going together usually. I will be using one of his bows and I had to buy some shafts. He said the arrows he usually used for that bow were Easton XX75 gamegetters 2216. In my area, all I could find were 2215s. So here is the question. What is the difference between the 2215s and 2216s. Does it relate to shaft diameter and thickness?? Any help will be greatly appreciated. Thanks!!