Excellent quality NGW® heavy duty clear plastic domes will help you create the perfect environment for seeds and cuttings. This is a high-quality professional propagation dome helps you control temperature and humidity. It is constructed from heavy duty, high grade plastic to maximize light penetration and stand up to repeated use. It will conveniently fit standard 10" x 20" propagation flats and come in various heights for small or medium sized starts and cutting. This listing is for the 4 inch Dome Only. NGW will help you double plant quantity with propagation domes.