Premium material: the outdoor hobby green house is made of a high quality aluminum frame and 4 mm twin-wall poly carbonate roof panels. The transparent panels help block uv rays but also allow maximum light transmission. Built-in rain gutter with hose: designed with rain gutters and hose for drainage purposes. It is a good way to collect the rain for watering the plants inside. Adjustable roof & roof hook: this aluminum frame greenhouse features 6 roofs vent with 6 adjustable angles for getting continuously fresh air to your plants.The built-in roof hooks provide more space for hanging pots. This item is made of aluminum and polycarbonate.