Outer and inner paper used for vacuum cleaner bags Specifications;1) 45-80gsm outer paper 2) Color: white, brown, yellow, green, dark blue 3) Air permeability: ≥250L/sqm.s 4) Dust retention: ≥90% Specifications:1) 16/18gsm inner paper 2) Color: white or brown 3) Normal air permeability: ≥800L/sqm.s 4) High air permeability: ≥2,100L/sqm.s Packing:Bulk packaging