Stay in the game with the Nerf Dog Hydro Sport ball! this one of a kind glow in the dark toy will keep your pet playful and engaged for hours. The sonic ball design features ridges that make gripping the ball easy for you and your dog! As an added bonus, the ridged textures massage gums and help keep teeth clean and tartar-free. this ball is 2.Inches and works in the Nerf Dog Tennis ball blaster. each toy is nerf-inspired and licensed, made of 100% non-toxic durable material for improved performance, function and safety, So you can focus on having fun!