"Room Darkening technology with magnetic closures blocks out some unwanted light while enhancing privacy Energy efficient design reduces energy lost through your windows by up to 25% Thermal properties help keep summer heat and winter chill out of your home Noise reduction up to 25% helps you get a sounder, more uninterrupted sleep Built-in metal grommets fit curtain rods up to 1.5"" in diameter.Pair includes two (2) panels. Measure carefully prior to purchase."