Product review (3 stars): Doesn't really stick
I recieved the covers and they were curled in the box because they were so long. So before you put them on the vents you have to lay them flat for a day between phone books to flatten them out. I had to cut them to size which was easy enough. I think that there was too much paint on my vents so they magnets do not stick. It may work for your vents but it didn't really work for me. This is why it recieved 3 stars. I had to tape the magnet covers to the vent. Another option is to get plain magnets from the hardware store to supplement the adhesion.