Our Cool Runners™ Textured PVC Puppy Tunnels are made of durable PVC material that is rot and UV resistant. This tunnel is 6 feet long, 16" in diameter with a 8" pitch (distance between the reinforcing wire rings on the tunnel). Our puppy tunnels are durable and ideally suited for helping puppies and small dogs get accustomed to running through a tunnel. The length of the tunnel is long enough to provide curvature but short enough to allow the handler to lure the puppy through the tunnel using treats.