17 tubular structures of plastic composite materials for use in gymnastic equipment, sporting equipment, and exercise equipment; tubular shafts of plastic composite materials for use in golf clubs, fishing rods, hockey sticks, baseball bats, tennis racquets, squash racquets, racquetball racquets, badminton racquets, table tennis racquets, and rowing oars and paddles; pipe and tubing of plastic composite material for subterranean use; plastic composite spoolable pipe and spoolable tubing for subterranean use