Grow, plant, or harvest year-round in your backyard. Tunnel Vision Hoops' 10 ft. wide and 12 ft. wide Backyard Greenhouses are perfect for home gardeners, restaurants, and homesteaders alike. Tunnel profiles are half as wide as the Tunnel Vision Hoops Farm Tunnels, and can extend to any length desired in increments of 4 ft. Each system is built out of 1.315" OD Galvanized Steel Tubing, and includes four cross brace, a single full length purlin, 2 in. x 6 in. Treated Lumber baseboards and hiprails, full length roll-up sides, full length rain water harvesting system, 3 ft. x 7 ft. front storm door, and rear zip up door.