【Package & Size】: Cell size: 18.5*14.5*11cm, please confirm it is suitable for your plants to grow. 【Upgrade Thickened Material】: Compared with other fragile products, our plastic lid and base are 0.8mm thick. Our seed tray set can withstand more pressure. Can be used repeatedly. Attention: Although it is very strong, it should still avoid exposing to the sun which is too hot. 【Seedling Tray】: Seedling trays are specially designed to hold many seeds from the germination stage until they are ready for transplanting. Using the trays ensures that each seed receives its nutrients and also eliminates the need for multiple plantings. 【Adjustable Temperature and Humidity】: Adjustable air vents help regulate the temperature and humidity of the seedling trays. With the humidity control dome, keep seedlings moist and reduce water evaporation, provides ideal conditions for faster seed germination. The bottom of the bung tray has drainage holes to prevent roots from dying due to excess water.