Soho White Grommet Blackout Window Curtain Panel ...SOLD AS SINGLE PANELONE PANEL PER PACKAGE... Triple-Pass foam back layer & Silver metal grommets sewn at the top of the panel, 1.5 Inch Internal Grommet Diameter. Blocks Over 99% of light than ordinary curtains Triple-Pass foam back layer Saves on home heating and cooling costs Saves on home heating and cooling costs 100% Polyester, Machine Washable.