20" x 48", 107W, Seedling Heat Mat, Engineered For Better Performance & Greater Durability, New, Stronger Heating Wire & Thicker Multi-Layer Construction Offer More Uniform Heating & The Durability To Withstand Rugged Greenhouse Environments, Increases Success Of Seedlings & Cuttings, Warms Root Area 10-20 Degrees Fahrenheit Over Ambient Temperature To Improve Germination.