Tempered Glass Stove Board This 10 mm clear tempered glass hearth pad provides effective protection for combustible surfaces against hot embers that may fall during loading of your fireplace. Perfect for fireplaces that do not require an R-value, it combines transparency and elegance, with polished edges for maximum safety. - Dimensions: 20" D x 70" W - Material: 10 mm clear tempered glass - Weight: 55 lb (25 kg) - Additional Features: Polished, non-sharp edges and corners