Sterilized bone
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That's what my B does as well. He's got 4 of them laying around. He'll sit down with one of them every now and then and gnaw on it for awhile.
I've got the Dentleys one also. Haven't noticed any pieces chipping off, but they do slowly wear down a bit over the years.
Yep, this one is tougher than the other one. I remember now having a sterilized bone for my last 2 Basenjis and it sat around the house for years. They barely chewed on it. They loved those rawhide chews. I had to take it away when it got down to 3" other wise when it got down to a 1/2 to 1" gooey mess they would want to swallow it.