ValuPrep syringe filters offer the confidence of Pall membranes in economic 1000 packs. These syringe filters are ideal for routine laboratory HPLC or UHPLC analyses.-Available in 13 and 25 mm sizes-Available in 0.2 and 0.45 µm pore sizes, contains Pall PTFE, PVDF, Nylon and wwPTFE membranes This product is not approved for use in medical, clinical, surgical or other patient applications.