Aluminum
Outsunny 8' x 4' x 7' Hobby Greenhouse, Walk-in Lean-To Polycarbonate Hot House Kit with Aluminum Frame, Sliding Door, Roof Vent, Green - Green
Amazon
Outsunny Walk-in Garden Greenhouse Aluminum Polycarbonate with Roof Vent for Plants Herbs Vegetables 8' x 4' x 7' Green