This kit includes the following: 2 Each) 36” x 4” x 1/4” Stainless Steel Wool Muffler packing. *Extreme High-Temperature stainless steel packing material *Reduces sound additional 2-4 decibels *Not affected by pressure and hot exhaust gasses *Compacts and degrades less over time than fiberglass pacing 2 Each) 12” x 12” x 1/4” Extreme Temp Fiberglass Packing *Extreme High-Temperature bonded fiberglass packing *Reduces sound additional 2-4 decibels *Low thermal conductivity at temps to 1200 degrees F *Excellent vibration resistance, will not powder *Excellent sound absorption properties *Will not contribute to metal corrosion