Greenhouse packages include the following items: Double layer 6 mil 4 year poly, C-channels & stainless spring wire, Modine heaters, exhaust fans with shutters & auto inlet shutters, 5 rows of 1.315″ x 14 gauge galvanized purloins, 2 3/8″ 14 gauge galvanized bows along with hardware and thermostats. Prices are for 5′ side walls. 8′ side walls available.