Nalgene MF75 Series Polystyrene with Sterile Lab Filter Unit, 0.1 Micron, 50mm Membrane Diameter, 250mL Capacity (Case of 12) Upper capacity: 250ml; receiver capacity: 250ml; pore size: 0.1m; membrane diameter: 50mm Material: polystyrene housing with a polyethersulfone (PES) membrane Ultra-clean sterilization of media protects against mycoplasma and bacteria contamination in biotech, pharmaceutical R&D, and scale up applications Membrane is fast-flowing with outstanding throughput; low protein binding Features graduated upper and receiver, and side-arm with cellulosic vent plug and quick-disconnect tubing adapter