SET OF TWO! Panels are engineered for extreme heat, have excellent thermal properties, and can be used in prefabricated and zero clearance fireplaces. Panels are 3/4" thick, and can be cut to fit'sizing requirements. They can be used as a left, right, or back panel, and are tapered on one edge for a finished look when used as a left or right panel. Large Brick Pattern: 24" (H) x 28" (W). Note: These are to be used in prefabricated and zero clearance fireplaces. Brick size 3" x 8".ATTENTION: This refractory meets ASTM C133 requirements. Do not use this panel if cracked or broken. Using a masonry or concrete blade, cut this panel to match the factory-installed panel you are replacing.