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 with 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.