Review (2/5): May not get all 4! Remove the ball!
They only packed 3 bottles when clearly the ad says 4. First bottle I used the brush came disconnected from the handle just when I filled the bottle haven't even used it yet.
I had to remove the ball prior to filling the others so it didn't mess up the brush on them as well. These are basic cheap bottles. We'll see if they hold up. But so far not so great. 2 stars for refunding me and just arriving in a timely manner.