50 Micron 7"x17" polypropylene Felt Filter Bag/Bag Filters ... steel snap ring 2.Stitched or welded 3.1um-300um 50 Micron 7"x17" polypropylene Felt Filter Bag/Bag Filters1 ... 300um [product catalogue]1.filter cloth sieriesMade of pp,pe,pa(nylon) in plain,twill,satin construction,any dimension is ... filter bag,needle punched filter bag,made of pp,pe,pa(nylon),the filtering precision can reach 1micron. 5.other ...