The Crypt Sealer is produced of high-impact, high density polystyrene and is now reinforced with twice the amount of ribs for a strong, rigid installation. Easily installed, this Crypt Sealer weighs only 5 pounds (marked for top). Can be trimmed to fit other dimensions. Caulking grooves on all sides of unit ensure a proper seal. Front is smooth and gray to match concrete. Cement board also available.