Heavy loose filter cotton white round filter paper dustproof U2K filter element protection cotton anti-welding electrostatic cotton 7CM

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Color classification:: 100 pieces of filter paper (about 9cm) single layer with gauze 200 pieces of filter paper (about 9cm) single layer with gauze 100 pieces of electrostatic cotton (about 7cm) four layers of filter layer 200 pieces of electrostatic cotton (about 7cm) four layers of filter layer 100 pieces of filter cotton (about 7cm) new polyester fiber cotton 200 pieces of filter cotton (about 7cm) new polyester fiber cotton 100 pieces of activated carbon (about 7cm) sandwich activated carbon particles 200 pieces of activated carbon (about 7cm) sandwich activated carbon particles 100 pieces of electrostatic cotton (about 11cm) T2 core special 200 pieces of electrostatic cotton (about 11cm) T2 core special