road and pathmaking materials; namely, aggregates made of natural or synthetic stone; fillers; namely, sand, compressed cork and waste materials comprised of slag and plastics; and binders; namely, asphalts and tars; synthetic running tracks composed of bonded stone aggregates and fillers; buildings composed primarily of non-metallic materials; namely, arenas; gallops and exercise areas for horses composed of bonded stone aggregates and fillers; non-metallic fencing for tracks and exercise areas