Nylabone Dura Chew Original Bone is a softer, chewier toy which makes them excellent for the average chewing dog as well as puppies and older dogs. A pacifying soft, durable chew. Made from tough thermoplastic polymer and manufactured with a special process where natural meat flavors are impregnated into the nylon, which insures that it will hold a dog's interest for a long time. Helps reduce tartar build-up. Safe and nontoxic.