1.PET+NY+CPE 2.Type:flat-open, self-sealing, envelope 3.Feature:anti-static,high barrier property puncture resistance .Nylon Vacuum BagVacuum bag(Nylon bag) has two types of material structure: NY/CPE & PET/NY/CPE. This product has such characteristics as good anti-static function, excellent vacuum pump effect, high transparence, low air(oxygen) transmission, good moisture-resistant property, ...