WOS - ЛюверсS is a very sturdy eyelet made of transparent plastic.
The Люверсы S are high frequency welded on the perimeter reinforcements made of WCV - СтропV of the vinyl film artifacts (screens and backdrops) and serve as a fixing point.
They must be used with soft, non-cutting through-fastening devices, of robust construction but sufficiently yielding not to damage the yet robust plastic of the ЛюверсыS.
The fasteners can be of the elastic type (i.e. WPE - Perofix) or non-elastic type (i.e. WLA - Вязки).