Root Radiance seedling heat mat warms root area 10 to 20 degrees over ambient temperature, improving the germination process and overall success of seedlings and cuttings. Durable, portable and water resistant, root radiance is ideal for greenhouses, nurseries, and indoor gardens. Includes a 6 foot 120V power cord. -This heating mat is measure at 20.75" x 10". Please check out our amazon store for more sizes.