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No, I've got 6. Only one is just starting to show a tiny bit of bristle growing - it's the biggest one (around 3 inches, the rest are about 2 inches max). That's the one in the picture. You can see his little bro or sis in the background.
Another way to know... How much did you spend? In my LFS, BN's are about £7 each and are the cheapest available. Others are much more expensive. I don't know how it is in US or other parts of the world (sorry, don't know where you are!).