as has been said its a throwing toy. several types 1 you just throw and catch, 1 screams when thrown, the faster the throw the louder it is, 1 you fill with water and try to catch without getting wet, another that you fire from an air pump.
keep it to play with they are good fun, espicially if you launch it at someone and they miss. it hurts. lots, if you you get it right.