【HOW THE LIGHT BLOCKER WORKS?. Light Blockers are an L-shaped piece of plastic that goes in front of or behind your window covering to block the part of the window that is not covered. 【EASY TO USE】Just peel the sticky backing and stick to the side of your window.
100% Blackout PVC Light Blocking Strips for 58.5″ x 1.2″ x 0.9″ White-2pcs
【HOW THE LIGHT BLOCKER WORKS?. Light Blockers are an L-shaped piece of plastic that goes in front of or behind your window covering to block the part of the window that is not covered. 【EASY TO USE】Just peel the sticky backing and stick to the side of your window.