Tepi ya duct, wotchedwansotepi ya bakha, ndi nsalu-kapena scrim-back-backed pressure-sensitive tepi, nthawi zambiri yokutidwa ndi polyethylene.Pali zomangira zosiyanasiyana zogwiritsira ntchito zomangira ndi zomatira zosiyanasiyana, ndipo mawu oti 'tepi yamatepi' amagwiritsidwa ntchito kutanthauza mitundu yonse ya matepi ansalu amitundu yosiyanasiyana.