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
Merck Amicon™ Ultra-0.5 Centrifugal Filter Units NMWL 3000; Sample vol.: 0.5mL; Final vol.: 20μL; Bulk Merck Amicon™ Ultra-0.5 Centrifugal Filter Units | Fisher Scientific