Hollow Clay Bricks are great for making decorative borders and wall borders. They are very versatile and can be made into any shape. are created by hand from a mixture of clay, water, and a binding agent. After a period of drying and heating, the bricks are baked to harden the mixture. They are then stamped with a symbol to denote their quality and color, and finally glazed with a protective layer of kiln-fired brick before they are ready to be used.