Lumanux Seed Propagating heat mat for Seedling, Cloning, & Germination - Heating Mat - 10"x20.75" Lumanux Seedling Heat mat is perfect for vegetable, herb, and flower seedlings. Warms root area to 10 to 20F above room temperature to Improve root growth Improve germination process and improve on seedling and cuttings success UL listed, waterproof construction retains moisture for optimal safety Dimensions: 10"x 20" Cord's Length: 6 ft