I bought 5 sets of these originally . 3 for my sisters cats and 2 for my cats. They fit great on the shelves of my kitty playpen. They take up very little room. I went back and bought 2 more sets because the food and water flow freely and I do not have to shake down the food like in the set I orginally had.(I spent a lot more money on it) I keep the other sets around the house for easy accesibility for all my cats.