Building materials and products, not of metal, namely, concrete, pumice stone, gravel, asphalt, pitch and bitumen asphalt; goods made of the aforementioned materials, namely, ready-mixed concrete, bricks, paving blocks, kerb stones, road making stones, cavity block stones, stones for slope stabilizing, palisades; rigid pipes, not of metal, for building; transportable buildings, not of metal; monuments, not of metal, of stone and concrete