Asahi APS Series Multiple-Use Hollow Fiber Dialyzers; a wet model multiple use dialyzer consisting of hollow fiber membranes of polysulfone housed within a plastic casing of styrene butadiene block polymer, filled at the factory with fluid to facilitate priming by the user, and sterilized by gamma radiation before shipment; Asahi Medical Co., Ltd., 9-1, Kanda Mitoshirocho, Chiyoda-ku, Tokyo 101-8482, Japan; Made in Japan; 12 units per case; Models APS-18R and APS-900S - 1.8 m2 surface area, Model APS-21R and APS-1050S - 2.1 m2 surface area