Heightening Design: Transparent cover height 3.9 inches", which provides more space for your seeds to grow. Seedlings can be taken care of for a longer period of time without worry about being blown away by the wind. Easy Control : Transparent dome on the seed starting trays have 4 adjustable vent allow you to regulate the temperature and humidity of your seedling environment, so you have total control over the growing environment. Good Observe for Palnts Growth: Maximum light penetration seed tray kit make it easy to observe your plants without interrupting the process. Perfect Size for Seed Starting: Size of the cells: 1.5”in Length and 1.5”in Wide, these seed trays are suitable for small seeds, such as flowers, vegetables, fruits, tobacco and other plants. Ideal Seed Planting Kit:With drain hole at bottom of each cell for proper drainage, reduce roots oversaturating, The basic base is very important to collect the excess water and fallen soil from the tray, keep it clean and tidy.