Shroom Supply Syringe Filter - 0.22 μm - PTFE Sizes: 13 mm & 25 mm - Available in both 13mm and 25mm diameters. These autoclavable 0.22 µm micron syringe filters are made out of a hydrophobic PTFE and are 100% reusable. They are perfect for inserting into liquid culture jar lids to provide contaminant-free gas exchange.