Tired of feeling that cold draft coming from your fireplace when it's not in use? These magnetic covers are the simple solution you've been looking for! Each pack comes with two flexible black magnetic sheets precut to 36x6 inches, ready to install right out of the package. The 40 mil thickness provides strong holding power that keeps them securely in place on your fireplace vents. They blend right in with most fireplace designs thanks to the plain black color that doesn't stand out. Just remember the most important rule - REMOVE THEM BEFORE STARTING A FIRE! But when your fireplace is cool and not in use, these covers work wonders at blocking cold winter air, pollen, summer bugs, and even helping reduce your heating bills. If you need to customize the size, you can easily trim them with scissors. They're reusable season after season and make such a difference in keeping your living space comfortable. No more chilly drafts making your cozy room feel cold - these magnetic covers create a tight seal that really works. Installation takes seconds - just press them into place and enjoy a draft-free home.