The Olymberyl Maximus (HF446) Side Bricks lines the sides of the firebox in your Hi-Flame Olymberyl Maximus, protecting the steel walls from direct flame and retaining radiant heat. Side bricks are consumable parts that wear with use, and this genuine spare is made to the correct specification for the Olymberyl Maximus. Keeping the firebox properly lined prolongs the life of the stove. Simple to replace.