The plant starter trays are made of upgraded PET plastic material that is heat resistant up to 120°F, suitable for heating pads and grow lights, and strong enough to be reused multiple times. PERFECT SIZE & PRACTICAL TOOLS - The seed tray cell tray measures 1.5 inches long x 1.5 inches wide x 2.2 inches high and the top lid measures 7.3 inches long x 5.7 inches wide x 2.2 inches high. The seed starter trays with humidity domes provide enough space for your plants and act as a seedling barrier, preventing damage from wind, rain, or cold. Suitable for planting various vegetables, fruits, flowers, and other seeds. ADJUSTABLE Humidity & Airflow - Turn the ventilation knob to control the indoor humidity from 50% to 100% for seedling growth. The transparent lid of the seed starter kit allows light to pass through and retains heat and moisture to ensure successful germination, especially suitable for seeds with high humidity and temperature requirements. Transparent Cell Tray - The