I produced the grass brick high-strength, low water absorption grass brick, nice grass brick fashionable and stylish. Strong frost resistance, anti specially for laying roads and sidewalks in the city parking lot, with a hole can be green grass and pavement surface engineering brick and hollow block and so on. Its surface may have surface layer (material) or no surface layer (material), and the true nature or colored. Concrete brick lawn grass cover up to 30%. Non-slip effect