PTF13-4501, 13mm 0.45um PTFE hydrophobic Syringe filters, 100/pk, 78 ; PTF25-2201, 25mm 0.22um PTFE hydrophobic Syringe filters, 100/pk, 90. Product Description – Made-in-China.com Syringe Filters, PTFE/PVDF/Pes/Nylon Membrane 0.22/0.45um Pore Size, 13mm Diameter, 100 PCS