Only 2 left in stock at this price! Lightweight, high strength, thermally efficient insulating blanket with a 2 millimeter aluminum foil backing used as a duct surround in furnaces, kilns, and boiler applications. Ships in a 1” x 24” x 25’ roll. Available in a 6 lb. density. Shipping is FREE when you place an order of $100 or more (continental US only).