Ideal for seed germination, early seedling growth, and cuttings propagation, the SUNDOME™ 2-inch humidity dome allows the grower to adjust the humidity levels to best suit the stage of growth using two adjustable vents on top. The clear, high quality BPA-free food grade plastic makes it easy to see the plants and observe their growth. It's standard size and compatible with 10in x 20in trays and heat mats as well as all others of that size.