The grey bricks are fired from clay, resulting in a dense, blue-grey product with excellent frost resistance and color. These bricks contain trace amounts of sulfur, which can kill bacteria, thus offering health maintenance, environmental protection, longevity, and durability. Marketed grey bricks feature a smooth surface, right-angled structure, compressibility, and wear resistance, making them ideal for residential wall and road construction. The art of grey bricks is not only for packaging but also inherits history; they are a work of art that can be appreciated and played with, nurturing both body and mind. The five elements are integrated into one, with a unified soul. Grey bricks are made from clay mixed with water, molded into shape, and fired in kilns at approximately 1000°C, then cooled with water to enhance weather resistance and water resistance. According to the ancient method of firing grey bricks in ancient architecture, clay materials are also important for modern blue brick firing materials.