Ideal for rooting large cuttings and/or growing cuttings to large size after rooting. But it is also useful for seed germination, early seedling growth, and propagating smaller cuttings. It allows the grower to adjust the humidity levels to best suit the stage of growth using its adjustable vents. The clear, high-quality BPA-free food-grade plastic makes it easy to see the plants and observe their growth. Its standard size and compatible with our 10″ x 20″ trays and heat mats as well as all others of that size.