X-Tire Balls are a pair of tires ruggedly molded as a single ball with a hollow center. Molded from Flexi PVC, they're durable, smooth, safe and fun! They're easy for dogs to retrieve and have a fun rolling action. The flashiest tires in town! In the center of X-Tire Rubber Ball is a red flashing Blinky Ball that turns on when touched, and turns off automatically. Blinky Ball provides over 70,000 brilliant flash cycles. Criss Cross Rubber Tires make it easy for dogs to pick up and fetch the toy. These deluxe toys are ideal for day and night time play. A perfect combination of toys with an upgraded electronics package for long-lasting fun. X-Tire Blinky Ball measures 5 inches in diameter. Although built tough for playing, X-Tire Blinky Ball is not intended as a chew toy.