This vented humidity dome is the only dome on the market with adjustable top and side vents to better control humidity and temperature. A must-have for rooting cuttings. These domes fit directly onto the standard 10x20" cut kit trays to create a humid and warm environment good for cuttings and seed germination. Tall 7" dome give extra height for your taller cuttings. Adjustable vents allow for perfect humidity & temperature control.