1.3mm Aluminum Alloy Frame4mm Twin-wall Polycarnonate Sheets with UV-protecting,  6cm galvanized Metal BasePanel spring design, more convenient installation than insert design, easy to disassembleWeather-resistant Backyard Greenhouse:Engineered with heavy duty and rust resistant aluminum frame with inserted PC panels. Galvanized Steel base including pre-drilled holes to installing the expansion screw for additional stability. Wind Rating: 50 mph; Snow Load Capacity:12 psf.Outdoor Plant Warm House: Protect plants from cold, wind, rain, and wild animals. Control heat and humidity. Let in 90% of light, and UV stop sun damage. This 0.15" twin polycarbonate wall walk-in greenhouse gives you a personal plant nursery for your garden.Adjustable Roof Vent: Take control of humidity; this winter greenhouse features 5 angles option to choose to let in fresh air in and easily manage excess moisture.Step by Step Installation: All accessories included and have marked No. for selected. Delivered with a comprehensive set of instructions. 2 competent DIY enthusiasts can erect this greenhouse kit in 3 hours.