Polyester Filter Bag 1.Material:Needle felt Polyester 2.Welding or Sewing 3.Plastic Ring or Steel Ring 4.Size,#1,#2,#3,# Polyester Liquid ... .(#1,#2,#3, ) 3).Long time filter bags.(#1,#2,#3, ) 4).High flux filter bag.(#1,#2,#3, ) 5 ... ).Oil absorbed filter bag.(#1,#2,#3, ) 6).High efficiency filter bag.(#1,#2,#3, ) 7 ...