Sunpack SunPad Lite 17W Propagation Heating Mat for Seeds, 9" x 19.5"SunPad Seedling Heat Mats are perfect for every gardener from beginners to professionals. Key Product Features Reliably warm the root zone to 10 F 20 F above ambient air temperature, creating excellent rooting conditions for seedlings and cuttings When used with a temperature controller and tray domes, growers can dial in ideal temperature and humidity The patented double layer construction is tough and waterproof, which makes them ideal for home