This is a BRAND NEW 18 ft long with 24″ opening dog agility training tunnel. The blue cover is made from durable intertwine wove oxford Dacron. Steel spring set diameter is 3mm. Grommets are made from steel, not plastic. Short stake design, will not scratch your pet. Tunnel is AKC compliant. What in the box: one 18′ dog tunnel, one carry case with clear plastic pouch, eight stakes packed in a pouch.