Palram Four Season Chalet Hobby Greenhouse - 12 x 8 x 9 Charcoal Gray 4mm twin wall roof panels block up to 99.9% Of UV rays and clear virtually unbreakable polycarbonate panels providing over 90% light transmission Reinforced, double wall & rust resistance aluminum frame 95 sq. Feet growing space and of head room Includes anchoring kit, threshold ramp, two roof vents, galvanized steel base and lockable wide double doors 5 year limit warranty