These plugs are made from heat resistant (up to 350*F) rubber to keep water, snow, ice, dirt and debris out of your hood exit exhaust dump tubes. They are made for a range exhaust tube sizes (1.5", 1.75", 2", 2.5", 3", 3.5", 4") and come with a red Remove Before Boost Flag attached. Other sizes of plugs are also available. Check my other listings or send me a message if you need a different size. Condition is New. Price is for one plug with updated REMOVE BEFORE BOOST flag. Key flags now say REMOVE BEFORE BOOST on both sides.