Constructed using sturdy metal wire coated with black electro-coat finish so it's made to last. For dogs that need a larger play area, or for multiple pets, you can connect two Frisco exercise pens together using the included snap hooks.The item "Frisco Dog Exercise Pen with Step-Through Door By Frisco with size 36 in/ 42 in" is in sale since Sunday, February 17, 2019. This item is in the category "Pet Supplies\Dog Supplies\Cages & Crates". The seller is "tran-2769" and is located in PA. This item can be shipped to United States.