0.8mm thick material: Compared with other 0.5mm plastic material, our seed trays use 0.8mm PVC material to be reusable, durable and not easily broken. (Note: Please avoid prolonged exposure to temperatures above 48°C) Unique Design: Adjustable window let you can adjust the inner humidity from 50%-100% to meet your needs. Transparent seed stray lets you keep an eye on the growth. Drain holes at bottom for better drainage. So you have total control over the growing process. Perfect Size for Seed Starting: Each cell measures 3.7x3.7x5.5cm, total 72 cells, suitable for small seeds, such as flowers, vegetables, fruits, tobacco and other plants. The mini greenhouse is suitable for balconies, terraces and windowsills. Compatible with Heat Mat & Plant Light: Can be used long-time in the temperature range below 48°C. A great way to foster a beautiful and healthy garden. Cover All You Need: The best choice for planting beginners. You will get 6 x seed tray, 6 x watertight base tray, 6 x lid