The KONG Marathon chew provides a mentally entertaining solution. This chew is ideally sized to fit inside KONG Classic rubber toys and is practical, mess-free and full of fun. For starters, the tasty bits awaken natural chewing instincts, then the sturdy exterior continues the attraction, and finally, the edible tips incite foraging instincts as they fall into the toy once the exterior has been chewed. KONG Marathon is natural, grain-free and proudly made in the U.S.A. Inserting the chew inside the KONG is easy, simply push and twist the chew to secure it inside the KONG and unleash the chewing extravaganza.