12″ x 24″ x 1/2″ thick sheet of high density Ceramic Packing material Fits most all repackable applications Unlike fiberglass ceramic is much more dense and durable Handles extreme temperatures (2500??F) without breaking down. Made in the USA Product description The Power Pack packing kit contains a (1/2?? thick x 12?? wide x 24?? long) section of 4 pound density ceramic material. This kit contains enough material to typically repack two motorcycle mufflers or one automotive muffler. Our ceramic packing kits are far more dense than normal fiberglass packing material allowing the that is repacked with our material to have a much better tone. Ceramic material is also superior to fiberglass in that it is much more durable and able to handle nearly three times the amount of heat than fiberglass. Our packing kits have sufficient heat resistance (2500??F) where they can also be used on pottery kilns, wood burning stoves, glass blowing furnaces