Jan 24, 2017 · Thank you for your question. We currently offer two different 0.22 micron PVDF filters, 13 mm and 30 mm. These two products are listed below. sc-358811: UltraCruz® Syringe Filter, PVDF, 0.22μm, 13mm, 75/case sc-358812: UltraCruz® Syringe Filter, PVDF, 0.22μm, 30mm, 30/case We will be updating product descriptions on our website today and the updates should show tomorrow.