It has an aluminum frame with advanced 4 mm twin polycarbonate roof that reduces solar UV by 99.9%. It came with a 5 year warranty, rain gutters and a magnetic locking door. The side walls are clear and allow for 90% light transmission. The roof does come with a vent that can be opened and closed.
When it arrive by UPS it came in two boxes. One box contained all the frame pieces, screws, nuts and bolts and the other box contained all of the polycarbonate wall and roofing materials.
I am very happy with my new greenhouse. The price was good and it serves my current needs in a greenhouse. If you decide to purchase a greenhouse, always do your homework and purchase a bigger greenhouse than what you need. This is my third greenhouse that I have purchased over 25 years. Always consider the price of electrical work, heating and cooling expenses, construction and greenhouse equipment when purchasing.