Parker Brothers originally developed Nerf, beginning with a four-inch polyurethane foam ball. In 1969, Reyn Guyer, a games inventor, came to the company with a volleyball game that was safe for indoor play. After studying the game carefully, Parker Brothers decided to eliminate everything but the foam ball. In 1970, the Nerf ball was introduced as the "world's first official indoor ball". Marketing text exclaimed, "Throw it indoors; you can't damage lamps or break windows. You can't hurt babies or old people." The ball filled a strong consumer need and by the year's end, more than four million Nerf balls had been sold. The four-inch ball was followed closely by a large version called "Super Nerf Ball". Shortly after, in 1972, a basketball game called "Nerfhoop" and the Nerf football joined the family. The football quickly became the most popular Nerf ball.
The company continued to add to the Nerf line until they handed control to Kenner Products, a sister company, in 1991, when Hasbro acquired the Nerf line through the acquisition of the Tonka Corporation. Throughout the 1990s and early 2000's, the Nerf brand served under the subsidiaries OddzOn and Larami before Hasbro took full control of the brand.
Over the years, Nerf has continued to expand the line, adding new looks to existing products. The current line of Nerf products range from various sport balls, foam blasters, and now onto video games and accessories.