You know how deer shed their antlers? These dog treats are basically harvested deer antlers that have already been shed (so no deer were harmed or killed for these). They're all natural and some dogs really love them. Plus, they're mineral-rich (calcium).
These are from real deer antlers that have been naturally shed (no killing of deers involved here whatsoever - and the deer grow new ones next year). They are mineral-rich and last a long time.