19 Concrete; concrete designed to absorb impact and regulate water, gas and moisture consistency in overlying ground, sand, soil, artificial and real turf and grass; concrete for golf bunker liners, golf courses, sports grounds and underlying ground, sand, soil, artificial and real turf and grass; construction materials not of metal, namely, concrete designed to absorb impact and regulate water, gas and moisture consistency in overlying ground, sand, soil, artificial and real turf and grass; construction materials not of metal, namely, concrete for constructing golf bunker liners, golf courses, sports grounds and underlying ground, sand, soil, artificial and real turf and grass; golf bunker system comprised of concrete designed to eliminate washouts, soil contamination and plugged ball lies; surface materials, namely, concrete designed to designed to absorb impact and regulate water, gas and moisture consistency in overlying ground, sand, soil, artificial and real turf and grass; surface materials, namely, concrete for constructing golf bunker liners, golf courses, sports grounds and underlying ground, sand, soil, artificial and real turf and grass