Sold as one unit. (1 unit = 12 each.) For setting and repairing furnaces, heaters, stoves, and boilers. Gas-tight and fire-proof. 2700 deg F max. Also a firebrick mortar. 1/2 Pt . Manufacturer number: FSC8. SKU #: 40985. Country of origin: (TBA). Distributed by Rutland Products.