Bases are a very good choice for aggressive chewers. These very large bases come from very close to the bulls head, just above the burr. They have calcified more around the edges and are very durable but still maintain the tasty center dogs love.
It's VERY IMPORTANT that you get a piece that's big enough for your breed. Meaning the whole antler piece won't fit into their mouth...
Medium Base $45 (one piece)