Hydroponics Inc Seedling & Propagation Heat Mat Hydro 20" x 20.75" Seedling heat mat for better plant growth and flower seed germination Warms root area 10 to 20 degrees over ambient temperature Dimensions: 20"x 20" Power Cord's Length: 5.7ft 45W Increases the success of seedlings and cuttings,durable construction, waterproof and easy cleaning Can be placed in many different sizes of seedling bowl.