The Decor Grates Floor Register 4x10 Black PL410-BLK is a set of 6 decorative grates designed to enhance the look of your home. These rectangular-shaped grates are made of plastic with a matte black finish, suitable for indoor use. Compatible with central furnace, whole house air conditioner & heater, and central air conditioner, these grates are an elegant and functional addition to any room in your home. Perfect for adding a touch of style to your living space, these Decor Grates are a practical and stylish choice for your home improvement needs.