Nerf Dog 2.5in. Squeak Tennis Balls Dog Toy, 3Pack Interactive: Squeaking sound provides hours of entertainment Highly Visible: Brightly colored so you and your pet never lose track, no matter where you toss it! Nerf-quality materials allow this toy to be lightweight and durable Multiple in each pack so the fun doesn't stop Blaster ready: these 2.5-inch tennis balls work in the Nerf Dog Blaster