The Systems in Kittywalk© Systems refers to the inter-connectivity of the different outdoor pet components. They can go together in a variety of different configurations giving you and your indoor pets a wide variety of options to enjoy the great outdoors. 

The curves come in a box of 4 (making a 180 degree curve). 
Box of 4 Curves contains: 4 curves & 2 doors 

* Completely enclosed with 2 doors 
* Can be used on any surface, grass, wood or stone. 
* Does not harm your grass 
* Works with all Kittywalk® outdoor pet enclosures. 
* Weatherproof rip-stop collapsible netting with a sturdy steel frame 
* Easy set-up. Snaps together in just minutes 
* Each curve section is 24" outer diameter X 18" wide 

THESE PRODUCTS ARE NOT TOYS AND SHOULD NOT BE USED BY INFANTS OR CHILDREN, FOR DEOMESTIC CATS & DOGS ONLY NOT FOR HYBRIDS, REFALS OR WILD ANIMALS. KITTYWALK® SYSTEMS PRODUCTS ARE NOT FOR PETS THAT CHEW.