Killerspin's 2 Oversized 44 mm and 2 Extra Large 55 mm Ping Pong Balls are perfect for outdoor fun and training. Featuring larger diameters and heavier weights, these jumbo balls cut through the wind outdoors. Plus, their bright yellow color makes them highly visible and easy to spot. These balls can also help players meet their training goals with their excellent bounce. Great for practice, even better for outdoor fun, these table tennis balls ensure you enjoy the game. Killerspin was built to bring youth and innovation to one of the world's most beautiful sports: table tennis. The Chicago-based company produces premium-quality table tennis equipment, sports apparel and media. Killerspin was created to serve the table tennis player, while providing U.S. homes and offices aesthetically pleasing table tennis gear for head-turning style and competition-level play.