SUNPACK's heavy-duty blackout humidity dome is perfect for adjusting the growing conditions for your seedlings. The domes help conserve watering while providing an appropriate blackout period. This heavy-duty plastic 7" Vented Humidity Dome for 1020 Trays also features a control dial to help regulate moisture and temperature for your germinating seeds and its heavy-duty plastic construction will endure through many growing cycles.
Dome dimensions: 21.5 in. L x 11 in. W x 7.5 in. H
Pleased with my purchase
Very good product. Only knock I have on it, is that they come included with vent covers for the sides. They do fit/work, however, place fingers on either side when you are installing them or the cover material will tear.