These things simply rock!  Have gone through a few of them with my dogs, they love them.  Purchased them as gifts for others dogs, they love them.  Where other chew toys get lost and forgotten, these dinosaurs have some kind of magic in them, the dogs keep coming back to them over and over.  They do wear after time and will need to be replaced, but I have 70+lb strong chewers and they last a very long time.  Even so, the pricing is awesome so you don't feel bad about buying more...