KONG Rambler Ball Dog Toy Two toys in one create challenging puzzle Tennis ball and squeaker entice play Ideal for interactive games; Discontinue use if damaged. Designed for light/moderate chewing. For tough chew sessions, try KONG rubber toys. Supervised use only. Remove all packaging. Add a second tennis ball for more challenge. Fits any standard 2.5 tennis ball or try KONG Squeakair Medium Tennis Ball.