Start your growing season early with everything you need in this kit to start your seedlings. It is proven that seeds grow better with ambient temperatures 10°F-20°F above room temperature. The Super Sprouter® Seedling Heat Mat will provide even warm temperatures for your plant starts. The 7in dome will give your plants more room to grow with humidity control. Kit includes: Super Sprouter™ Seedling Heat Mat 10 in x 21 in; 72 site Seed Cell Tray Insert; 10 in x 20 in Propagation Tray; Humidity controlled Super Sprouter® 7 in Propagation Dome with Vents. Clonex® Cloning Gel packet (EPA No. 79664-1). The Seedling Heat Mat is ETL listed.