plastics in extruded form for use in manufacture; packing, stopping and insulating materials for use in coating and covering for watertightness and airtightness for sport grounds, gardens, playing fields, phonic isolation or installation of concrete pavements; flexible pipes, not or metal; elastosynthetical products namely, covering for sport grounds, pavement for gardens and leisure grounds; slabs, sheets or rollers for mechanical protection from leaks; slabs, sheets or rollers for phonic i...