Portable skating rink structures, not of metal consisting of sideboard sections, gates, and structural parts, not of metal adapted for all kinds of sports and for both indoor and outdoor use; flooring and floor constructions not of metal adapted for all kinds of indoor and outdoor sports, namely, non-metal floor tiles and non-metal floor boards; floor tiles, not of metal; non-metallic building and construction materials, namely, terra-cotta for use as building materials, non-metal rumble stri...