17 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 isolation; strips for installation of concrete pavements such as terraces, verandas, balconies or streets; rollers serving as support to polyurethan resins for sport rooms and for the manufacture of athletics floors; square rubber carpets for use particulary in the finishing of floor