Protect your investments. Carbons and other particulates are sprayed out when you start your car. These can stain your wall, floor, car and even your art. ( We've seen one of the large silk prints in a Ferrari Dealership ruined when a salesman forgot to use our blast shield, expensive mistake).Simply lean the shield(s) over your exhaust, the light design allows it to blow off on startup, it's resilient material is strong enough to handle being driven over on occasion if you forget about it. Sold 2 to a set.