We recently tried a new type of bone called Marrow Chews by Yuppie Puppy. They are durable nylon bones with jerky filling. Our three dog LOVE them and they are supposed to clean teeth and strengthen gums. We let our dogs chew on them for 30 minutes unless they stop on their own. We purchased them for about $7 and so far they have lasted about 2 weeks with 30 minutes of chewing per day. I recommend these for chewers!