This play pin is purrrrfect! 
Our Tuxedo cat and her kittens love the pin. The kittens have more than enough room to play around. We love the height and how huge it is, the kittens cannot get out and potentially get hurt, we let the two little kittens out when we are able to monitor them and we think the mom cat loves the fact that she can get out whenever she wants to get some stretch time or food, etc. 
We dont even have all of the sides attached, we left two out and its still huge enough. Get this play pin, especially if youre training your pet or have tiny pets. Recommended!