Top cover: The height of the lid has been increased to provide sufficient space for flowers, vegetables, fruits, herbs and other plants to grow. It is not only suitable for seed germination but also for plant cuttings germination. Tender plants can stay longer in the seed starting tray. 0.8mm thick material: Compared with other 0.5mm plastic materials, our seedling trays use 0.8mm PVC material to be reusable, durable and not easy to break. (Note: Please avoid prolonged exposure to temperatures above 48C). Unique design: The adjustable window allows you to adjust the indoor humidity from 50% to 100% to meet your needs. Clear seeds allow you to keep an eye on growth. Drainage holes at the bottom for better drainage. So you have full control over the growing process. Perfect size for seed starting: Each cell measures 3.7x3.7x5.5cm, 120 cells in total, 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 the heating mat and the plant lamp: Can be used for a long time at a temperature below 48C. A great way to promote a beautiful and healthy garden.