7"x17" Nomex Materail Filter Bags 1.Excellent high temperature resistance 2.Sewing 3.Steel Ring 4.Size 1,2,3,4 or customer 7"x17" Nomex Filter Materail Filter Bags were made by PP,PE ... with filter bag vesse together. 7"x17" Nomex Filter Materail Filter Bags1).Nominal micron filter bags (#1,#2,#3, ) 2).Absolute micron filter bags.(#1,#2,#3, ) 3).Long time filter bags.(#1,#2 ...