If you just want to open it and shoot it, a big bored one. If you want to sort them out, a kit.
Balls are in good shape
Sorting, or the inconsistency
I bought four cases of this stuff for 30 a case. I got it and opened them up, and noticed that my batch has mostly mis-printed Xball Gold, with two gold shells (as opposed to one) and the Hellfire ornage fill. I also got a lot of yellow balls that say "Rage" on them. These balls in particular have some messed up letting on the shells, with some smeraing and warping of the letters. The balls themselves are fine, though. I also got a small amount of the following: Visible Impact with orange fill, two silver shelled Xball Silver with orange fill, Xball Bronze with ornage fill that either say CFOA or Gatsplat on them, and pink Midnights. Sorting them is tedious, but it's always fun to see what you got.