Premium Aquatics 200 Micron Felt Filter Sock - 7” x 32” with Plastic RingPremium Aquatics 200 Micron Felt Filter Sock Bag 7 x 32 with Plastic Ring MADE in the U. S. A Standard Felt Liquid Filter Bags Micron rating of 200 Broad chemical compatibility High flow low pressure drop Sewn construction plastic flange Temperature ratings to 275F (Polyester) Felt Bag Materials Constructed using 100% synthetic fibers in polyester. The proper combination of fiber diameters, weights and thicknesses result in an economical depth filter