13 MM Sterile PVDF Syringe Filter 0.22uM & 0.45uM, Individual Sterile PVDF Syringe Filter, Individual Packed, 0.22 and 0.45 uM Pore Sizes, 13 MM Diameter Disc, Hydrophobic, 50/Pack. Membrane Solutions Sterile PVDF Syringe Filter, Single Packed, 0.22 Micron and 0.45 Micron Pore Sizes. 13 MM diameter disc size. 100/pack. $65/pack of 50 syringe