Five balls total, nested inside each other. They all move freely (detached) and have star-shaped holes in them. Just for fun; something to fidget with. My cat has also been known to have fun batting it around. :) Please note, however, that this is not a toy and should not be given to children or animals that could swallow or chew it.
The ball in the photos is made in White Strong and Flexible; it appears tinted pink because I let it spend a few days in a dye bath.