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Better than a frisbee - take this to the park and throw it to your friends in a cross between catch and throwing an American football.
The ball has a hand grip so you can target your passes better and it's long-distance tail helps send it flying much further, the record so far being 100 yards! What makes it really fun is that the Mega Howler gets it's name from three separate whistles built in that combine into one awesome noise as it hurtles through the air. Brilliant.
Nine year olds are clever little fellows and have lots of interests. Great presents for 9 year old boys are remote controlled cars or flying objects, science construction kits, anything that shoots, or outdoor gear. Magic is popular and anything involving pranks will appeal to that 9 year old sense of fun. Or get them a great book.