EMD MILLIPORE UFC501096 Amicon Ultra Centrifugal Filter Unit with Ultracel-10 Membrane, Clear, 0.5 mL Volume, 1 sq. cm. Filtration Area, 10.8 mm Diameter x 49.9 mm L: Amazon.com: Industrial & Scientific
Millipore UFC501024 Regenerated Cellulose Amicon Ultra Centrifugal Filter Ultracel-10 Membrane for Protein Purification and Concentration, 0.5mL Capacity, 10kDa NMWL, 10.8mm Diameter x 49.9mm Length, 1 sq cm Membrane (Pack of 24): Science