About 1/5 of these just slipped off the pen and didn't fill properly. The ones that were completely filled worked well for their intended purpose - splashing water on the child's head. The ones that didn't break just bounced off and didn't even break on the grass. If you know how to throw a fastball, you have an advantage. I was very glad that they are not bigger. Fits comfortably in your hand. Somewhere between baseball and softball with the right filling. Not as fun as the ones we used to fill the kitchen sink with because they all fill about the same size or less. The children were enthusiastic about how the fountain pen worked. They walked for hours sucking on plastic fillers. We had more fun yelling at them to get the fillers out of their mouths than wetting each other. Just get double the amount you expect to use if you really want to wage an all-out war.
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