Thanks for choosing our ZENY products. This heavy-duty pet playpen is made of durable iron metal, lasting for a long time use. Exercise pen works great as a puppy playpen or as an exercise area for non-climbing small animals including Rabbits, Ducks, Turtles & Guinea Pigs and so on. 8 panels create an big area for pets to play. Great for indoor or outdoor use. It is easy to set up with no tools required.