Aquarium gravel; Bicycle storage racks, not of metal; Cast stone garden and household ornaments; Cobbles and boulders; Decorative aquarium stones; Garden gnome figurines comprised of clay; Non-metal structures for mounting solar panels; Non-precious stones for garden or ornamental use; Palings, not of metal; Plastic reinforced wall panels for use as sound and light barriers; Posts, not of metal; PVC roofing membrane; Storage tanks of masonry