Just found an un-open package of Nylabone.

On the pkg.
(saves dogs lives and costly surgery)
The little thin shavings that are raked off in chewing and swallowed pass through
with-out effect. This product is not
designed to be consumed.
Nontoxic-ingredients Nylon, liver meal.

I use the Nylabones in-liu of the Gummybones
for when the pups no longer have their baby teeth or when they become aggressive chewers.
If you find out information from your vet
etc. that they are not safe please
let me know. I have been using them for
years instead of the rawhide.
(if you do decide to try them make shure
you get the correct size)