My chins go through these like there is no tommorrow...
http://www.thatpetplace.com/pet/prod/202176/product.web?gdftrk=xh23lc0p/7HDy~g3JgKLczeusaZ7r0Yf8Q97M400m2qVYI0ulTus63ZGp0jesCF7dNW05Uv838WWeJpaPbE~1F9H4tbEd0nOZBQGvrGT~vcqBvL7ZIVeCkkB1ULiinCBz/lor37XxdixvIerQBUVlg__The sticks that have holes in them that hang on the metal toy thingy...they chew but aren't "crazy" about. And the flavored wooden chews...they will chew but not often.
This they loved...but it had a plastic holder. That they didn't mess with due to loving it. But it is imbedded on the holder so they do chew down to plastic. By the next morning it was GONE!
http://www.petsmart.com/product/index.jsp?productId=2753309Their teeth are fine...but I worry that they only prefer mostly the lava bites over the rest.
Anything else I can try to offer them?