THERMAL ZERO MPK1 Ceramic Muffler Packing Material kit for 2-Stroke 4-stroke ATV Motorcycle Dirt Bike Exhaust Silencer Spark Arrestor Muffler Packing Repack Universal Wrap 12" x 24" x 1" thick sheet of high density Ceramic Packing material Fits most all repackable muffler applications Unlike fiberglass ceramic is much more dense and durable Handles extreme temperatures without breaking down. Made in the USA