Its so cute to watch them use it .. hmm i should just do the video now so you guys can watch. Its basically a series of comblike bristles for the three things on the side .. the top part has a chewy knob, and a hole where the cat can't reach the catnip .. so he chews the knob like crazy, while along the sides of the top there are ridges to rub their face and chin .. hehe its very cute