Virtually unbreakable 4 mm twin-wall polycarbonate roof panels block up to 99.9% of UV rays and diffuse sun light eliminating the risk of plant burn and shade areas STURDY THOUGHTFUL CONSTRUCTION WILL LAST A LIFETIME - Chosen by Better Homes and Gardens as the Best Overall Greenhouse Kit of 2024. Panels block harmful UV rays to protect plants from sun overexposure. The sturdy, oxidation resistant powder coated aluminum frame includes a galvanized steel base to add structural stability. Rust resistant aluminum frame extends 7'-5" from floor to peak Kit Includes adjustable roof vent, rain gutters, lockable hinged door with magnetic catch, aluminum frame, polycarbonate panels and a galvanized steel base Withstands winds up to 47 mph and supports snow loads of up to 15.4 lbs. per sq. ft.