The black metal Exercise Pen / Pet Playpen by New World Pet Products provides a great enclosure to keep your dog (and many other pets) safe & secure while indoors or outside. These Exercise Pens / Pet Playpens are made of very durable metal wire that features a black E-coat finish for long lasting protection against rust and the elements. You can use these Exercise Pens separately or attach them to a New World dog crate to create a large puppy playpen for your pet to roam. Available in 5 different heights (24', 30', 36', 42', 48').