It is a catnip stick from a catnip bush so they love it for one thing. As for the bark, it helps clean their teeth when they chew on it. No, the bark does not need to be removed. I have 4 cats in the house and when I get the bag of these out, I have to give every one of them a stick of their own! They love them!
2. Can anyone tell me the average size of these sticks?