The IRIS 24'' Exercise 4-Panel Pet Playpen with Door can be utilized indoors or outdoors; the pet playpen is portable and provides 8 square feet of play space for pets! Each panel measures 33.6"W x 24"H; door measurements 14.5''W x 16.5''H; the distance between bars is 1.5'' Dimensions: 35.25"L x 35.25"W x 24"H To create a more spacious exercise pet playpen, add IRIS 24'' Exercise 4-Panel Pet Playpen Panel Add-On, Dark Gray, ASIN: B00PK1N5FG and IRIS 24'' Exercise 4-Panel Pet Playpen Roof, White, ASIN: B006UJGFZY to keep pets safe and secure! Made in the USA of durable, heavy-duty molded plastic, and the playpen will never rust