These worked well to block out the light as claimed. They are made from a sturdy material as to not wear down easily. The included instructions were a little confusing as it refers to a tab when this step doesn’t actually seem relevant. I ended up watching a YouTube video showing the steps and it was very easy to twist the design. My only complaint is due to the twisting up top it ends up making the width of the curtain shorter than expected. You may need more to cover your window effectively if they are the same width as the curtains are noted. I would recommend these but just be mindful of the width you need.