5 Packs Seed Starter Trays, Seed Starter Kit with Adjustable Humidity Domes and Base Trays, Ideal for Greenhouses and Seed Propagation (12 Cells per Tray, Black) Monitor Your Plants Easily: The high-quality, clear plastic of these cell trays lets you observe your plants without disturbing their root growth. Complete Control: The adjustable vents on these seed trays allow you to regulate temperature and humidity, giving you full control over the germination process. Ideal for Large Seeds: Each cell is 1.5 inches square, providing ample space for larger seeds like potatoes, tomatoes, peppers, and eggplants. Six trays equal the size of a standard 1020 flat. Heat Mat Compatible: These seed trays are designed to withstand high and low temperatures, making them perfect for use with a heat mat without worrying about warping or melting. What’s Included: The package contains 5 clear trays with draingae holes, 5 black base trays, 5 humidity domes, 5 adjustable vents and 10 plant labels for marking seeds.