Dear Sirs, I am looking for hollow fibers made of Polyethersulfone or Polypropylene or Polyacrylonitrile (biocompatible) with cut off 5-10 KDa and OD 500um. Please advise me who is the manufacturer of this kind of hallow fibers. Best regards. Itai Pelled Carmel Biosensors Ltd. Matam Haifa 31905 Israel fax: 972-4-8550857 e.mail: carmelbi@netvision.net.il