0.8mm thickened material: Compared with other 0.5mm plastic material, our seed trays use 0.8mm PVC material to be reusable, durable and not easily broken. (An opinion: Please avoid prolonged exposure to temperatures above 48°C) Unique Design: The adjustable window allows you to set the internal humidity from 50% to 100% to meet your needs. Transparent seed litter lets you keep an eye on growth. Drainage holes at the bottom for better drainage. This gives you full control over the growing process. Perfect size for starting seeds: Each cell measures 3.7 x 3.7 x 5.5 cm, making a total of 72 cells, ideal for growing herbs, flowers, lettuce, fruits, vegetables, cuttings or preparing seeds . The mini greenhouse is suitable for balconies, terraces and windowsills. Compatible with heating mat and plant light: Can be used for a long time in the temperature range below 48°C. A great way to maintain a beautiful and healthy garden. Cover everything you need: The best choice for novice growers.