PTFE Membrane Filters, 0.45 um, 47mm, Nonsterile, 200 per pack, SF13861 Regular Price $184.12 Price $160.10 Add to Cart Tisch Scientific Nylon Membrane Filter, 0.45 µm, 25 mm, Nonsterile, 200 Pack, SF13878 Regular Price $88.22 Price $76.71 Add to Cart Polypropylene Membrane Filters, 0.45 um, 90mm, Nonsterile, 100 per pack, SF14556