The Sunlight Supply Classic Grow Tent greenhouses are compsed of a light-tight and light weight material with highly reflective interior surface walls. Reinforced stitching in high wear areas and heavy duty zipper creating a rugged and durable grow environment. The internal exoskeleton that holds up your tent is comprised galvanized steel poles and unique quick connect molded plastic corners. Features: Quick Assembly Strong plastic molded corners: no bolts to lose Velcro tray bottom High and low lamp/power cord ports 10 duct ports Large for the biggest ID trays available Actual Sizes: #749900 - 52.7 x 34.4 x 79 #749905 - 40.2 x 40.2 x 79 #749910 - 56.8 x 56.8 x 79 #749915 - 112.8 x 56.8 x 79