DINEEN Coal Saver sides and backs are made from refractory fireclay. They are designed to reduce the amount of coal/fuel which is used in the fire. These Coal Savers have been fired to over 1050°C and will withstand any domestic fire and not disintegrate. They are ideal if you don't need a large fire and they can be used continuously or on a temporary basis as they are just freestanding on the fire-grate.