... Feature:1, Ultrasonic sealing2, Large dust holding capacity, Low pressure3, Long service lifeBetween each bag there is a metal stick to ... made of anti-static fiber, large dust holding capacity and long working life. Material and operating conditions: Grade/typeF5,F6,F7,F8,F9 ... 595*500*83200100>95 Product picture: Factory pictures:Certificates ISO and SGS: Washable Pocket Filter F9 with long life