Features: Double glazed. Aerodynamic shaped glass dome. Weatherproof Poly carbonate. Tinted light grey. Easy to clean. Blackout Blind and fly screen. 1 easy handy operating lever. 3 Open Positions (inc bad weather position.) Automatically locked when closed. Frame made of durable weatherproof ASA. Size 400mm X 400mm Available for roof thickness 43-60mm. Without Constant Airflow.