SEEYE Blackout PVC Light Blockers for Window Blinds and Shades, Light Blocking Strips Block Light Along Two Sides of Windows for Bedroom Nursery, Easy to install(Black, 29.5" L x 1.4" W x 0.8" H-4pcs)

We use these for our two kids rooms and if installed correctly it is perfect. We have pull down shades and adding these back the room pitch black. Comes with magnetic strips which is a nice convenience.

The product is good, and does what it's supposed to but the method of attaching is via magnetic strips. This would be fine but the material is plastic so you need 2 magnets per side, one for the unit, one for the window. Again, this is fine but the adhesive used on the magnets is clear so a tiny amount of light still shows.... This could be avoided completely if you just use a colored two sided tape.

Easy installation works well

These do help with the light that bleeds out from the sides of the blinds. But, can be difficult to install. In the end, we didn't leave them up as blackout curtains did the job way better.

Cheap low quality

The 3M strips that are supposed to hold the magnets are very weak. Most of them fell down within a few hours.

I did not use these as they are intended (for window blinds or shades) I cut and mounted these in front of my under cabinet lights in the kitchen. Even with light rail on my cabinets, the under cabinet lighting was so glaring!😩 It was really driving me crazy! I looked and looked for a product that would work to help correct this problem. I looked for hours and hours then I stumbled upon these 😃 They worked exactly as I had hoped!I just used a few pieces of double-sided tape to adhere each cut piece to the underside of the cabinets, just in front of the under cabinet lights and Voila! Problem solved…

Once I figured out that the magnetic strips were supposed to be installed on both the wall and the product, it was easy to install but I'm still not sure how long it will stay up. Instructions regarding this would have been nice.