The Yield Master 10 inch Reflector has a heavy-duty gasket that makes it airtight. Included is tempered glass, a built-in socket and 15' lamp cord. The Yield Master is lined with highly reflective European aluminum interior for excellent output and uniformity. It achieves Maximum air-cooling with built-in 10" fittings. Included in this hoods design are "glass retention bars" hold glass firmly in place.