Dental toy your dog is guaranteed to chew. Cleans your dog's teeth as they chew. Replaceable all natural rawhide rings. Made of tough nylon and rubber parts. Rawhide contains no additives, preservatives, or artificial flavors.
My 35 pound beagle-mix demolished both rawhide disks in about 40 minutes, but keeps on chewing on it since bits of softened rawhide are stuck between the bristles and rubber nubs. Definitely worth the money - has lasted more than 4 times the average rawhide bone and he is actually ingesting less rawhide than with a regular knot rawhide.
Got one for my Rott, and she loves it. Got a 2nd one for my new puppy. Lasts about an hour for each dog. The puppy is ready for a nap after her hour-long chew. The rawhide rings are kind of expensive, but I think it's worth it because the dogs are clearly entertained, so they don't develop destructive chewing habits.