The facade bricks (non-perforated) have five sand covered sides and one side with possible oblong groove. The structure looks rugged with fine and irregular grooves in the sandy surface. The baking process takes place in a gas-heated tunnel oven under slightly reduced atmosphere.
The base of the brick is red. The colour shades vary from red-beige and grey-white to black with reduced spots, with white deposits visible. The ageing process also influences the colour shades.
The colours shown are a near reflection of reality.