Sun Zero Preston Energy Saving Blackout Grommet Curtain Panels infuse a modern sophistication into any living space. Equipped with built-in metal grommets for easy hanging on standard curtain rods up to 1.5" in diameter. Sun Zero Blackout technology blocks out most outside light, offers outside noise reduction by up to 25%, and decreases energy lost through your windows by up to 25%. Comfort is optimized with thermal properties that help keep summer heat and winter chill out of your home. Hang in your living room for enhanced privacy, or in your bedroom for a sounder, more uninterrupted sleep.