You will receive 24pcs adhesive metal plates for magnetic, practical and easy to use, sufficient quantity to meet your needs Make of nonmagnetic iron, our metal plates adheres only by magnets With these metal plates attach around the vent, you can enhances the magnetic vent covers for the best seal These metal strips is specially designs for aluminum, plastic, and other nonsteel vents Easy to install: Use a strong adhesive backing to make sticking easier, Manufacturer: Xuancai