Sterile, Cell Filter Strainers with Nylon Mesh - Three Pore Sizes available See our Celltreat PROMOS section for Special Offers. Use with 50ml Centrifuge Tubes - Units feature polypropylene Tabs for Handling Gamma radiation sterilized - Individually Wrapped or in BulkPack CHOOSE: - Individually Wrapped or Multi-Pack; Sterile, 50 units/pack