Well, I'm doing a Apple of Eden from the game Assassin's Creed... 4 of them to be more exact. I wasn't sure about the size, these are the two smaller size that i found for hollowed styrofoam, i thought one was too small and the other too big for it ¬¬' so i bought the two sizes anyway, and a extra for each size in case I screw up some ball in the process.