Wham-O Inc. is an American toy company based in Carson, California, United States. It is known for creating and marketing many popular toys for nearly 70 years, including the Hula hoop, Frisbee, Slip 'N Slide, Super Ball, Trac-Ball, Silly String, Hacky sack, Wham-O Bird Ornithopter and Boogie Board, many of which have become genericized trademarks. Corporate history Richard Knerr (1925–2008) and Arthur "Spud" Melin (1924–2002), two University of Southern California graduates who were friends since their teens, were unhappy with their jobs and decided to start their own business. In 1948 they formed the WHAM-O Manufacturing Company in the Knerr family garage in South Pasadena. Their first product was the Wham-O Slingshot, made of ash wood, which Knerr and Melin promoted by holding demonstrations of their own slingshot skills. The name "Wham-O" was inspired by the sound of the slingshot's shot hitting the target. The powerful slingshot was adopted by clubs for competitive target shooting and small game hunting. When they outgrew the garage, Knerr and Melin rented a building on S. Marengo Ave in Alhambra, California; and then, in 1955, moved their manufacturing plant to neighboring San Gabriel, California where they remained until 1987, when they sold the plant to Huy Fong Foods. Products and marketing In 1957, Wham-O, still a fledgling company, took the idea of Australian bamboo "exercise hoops", manufactured them in Marlex, and called their new product the Hula Hoop. (The name had been used since the 18th century, but till then was not registered as a trademark.) It became the biggest toy fad in modern history. 25 million were sold in four months, and in two years sales reached more than 100 million. "Hula Hoop mania" continued through the end of 1959, and netted Wham-O $45 million (equivalent to $ in ). Shortly thereafter, the company had another huge success with the Frisbee. In 1955 inventor Fred Morrison began marketing a plastic flying disc called the Pluto Platter. He sold the design to Wham-O in 1957. In 1959 Wham-O marketed a slightly modified version, which they had renamed the "Frisbee" two years earlier in 1957 - and once again a Wham-O toy became a common part of life through the 1960s. In the early 1960s Wham-O created the Super Ball, a high-bouncing ball made of a hard elastomer Polybutadiene alloy, dubbed Zectron, with a 0.92 coefficient of restitution when bounced on hard surfaces. Around 20