The Kong X-Large Stuff-A-Ball is made of Durable Rubber and measures 4 inches high 4 1/4 inches across and 4 1/2 inches deep. It has 16 Vertically Grooved Treat Slots w/Treat Grip Ridges plus a Hollowed Core giving you an outstanding Treat/Dental Work Out System. This Ball has the highest flexibility of any canine treat device on the market and that equals high tactile enjoyment for your pet.