An “AXIVA – PES Syringe Filters – Sterile 25 mm Dia 0.2 μm Micron Rating” refers to a sterile syringe filter manufactured by Axiva, with a 25mm diameter and a pore size of 0.2 microns, made from a PES (polyethersulfone) membrane, primarily used for filtering small volumes of liquid to remove particles as small as 0.2 microns, often used in laboratory applications to sterilize solutions by removing bacteria and other microorganisms