The Roto Grip Hot Cell Radioactive Solid Urethane Bowling Ball is a high-performance, vintage bowling ball designed for ten-pin bowling. With a classic red color and a matte finish, this 15 lb bowling ball features an asymmetrical core made of urethane material. The Hot Cell model is ideal for medium-dry lane conditions and is approved by the United States Bowling Congress (USBC) for competitive play. Made in the United States by Roto Grip, this bowling ball offers a smooth and consistent motion on the bowling lane, making it a popular choice among serious bowlers looking to improve their game.