This item Whatman PTFE 0.2um 25mm Filter 10pk Biomed Scientific Syringe Filters PTFE Membrane 25mm Diameter 0.22um Pore Size Non Sterile Pack of 10 Whatman 6900-2502 GD/X 25 Sterile Syringe Filter, 25mm, 0.2 Micron, PVDF Filtration Medium, Pack of 50