Made to endure and satisfy those dogs who can't get enough of chewing, the KONG DuraMax Ball features the ultra-durable KONG-made K-100 material that provides just the right amount of flexibility to make it irresistibly satisfying while also holding up to prolonged chewing sessions . Dogs enjoy the feel of the textured surface and the ridges which also help clean the teeth. A beep function adds to the fun and keeps dogs engaged for prolonged chewing and playtime. 6cm