Wikipedia
Wham-O
Wham-O Inc. is an American toy company in Woodland Hills, California, United States. They are known for marketing many popular toys in the past 50 years, including the Hula Hoop, the Frisbee, the Slip 'N Slide, the Super Ball, the Trac-Ball, Silly String, the Hacky Sack and the Boogie Board.