Propellers break very easily. Be sure to show the kids how to use it. Practice it slowly at first. Make sure the little launcher is pointing in the right direction or you will break the propeller. Put it on like an inverted top hat. I bought them for my second grader and I have to say they really love them. Stay away from trees and roofs ha ha ha. It's a good thing there are 40 in the pack as some of them will break.
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