7"x17" PP/PE needle Felt Filter Bags 1.Material:Needle felt PP,PE 2.Welding or Sewing 3.Plastic ... Steel Ring 4.Size, 7"x17" PP/PE needle Felt Filter Bags were made by PP,PE,Nylon,Nomex ... with filter bag vesse together. 7"x17" PP/PE needle Felt Filter Bags1).Nominal micron filter bags (#1,#2,#3, ... : A-B-C-D-E-F-G-HA: PP(Polypropylene)PE(Polyester)NMO (Nylon Monofilament)NME( NOMEX)OIl AbsobentB: ...