The Clean Living Playpen easily attaches to any Clean Living Cage, but can also be used as a stand alone playpen. To expand the small pet's living space even more, connect the Playpen's end to end. Easily attaches to any Clean Living Cage Expands pet's living space Offers the convenience of a freestanding playpen Made of waterproof stain resistant canvas Use with Clean Living Floor Cover item 02075 Expandable - Connect 2 sets to double play space Can connect two sets to double play space