Affordable Agility Practice Crawl Tunnel Frame made from furniture grade 1" outer diameter pipe (3/4" inner diameter) Fabric roof is made from waterproof rip-stop nylon Includes 4 internally sleeved rods for the fabric roof support Roof adjusts to heights of 24", 20", 16", 12", and 8". When assembled, measures 75" long by 33" wide and 33" high