BLOCKS 100% of LIGHT: Light blocking strips are perfect for window coverings in offices, media rooms, bedrooms and any place where people take naps since they block out light from entering from the sides.
CUT AT HOME: Light blocking strips can be cut to the exact size of your window and they are available in a variety of lengths.
HOW THE LIGHT BLOCKER WORKS: All window blinds and shades must be constructed just a bit smaller than the window opening to avoid rubbing against the window frame when the blackout window covering is lifted or lowered.
EASY TO USE: Simply remove the sticky backing and adhere to the window's side. Works on roller blinds, honeycomb blinds, windows, wooden blinds and more.