Implantation of individual micro-dialysis hollow fibers are ideal for the recovery or introduction of micro-quantity biologicals or pharmaceutical materials in a localized tissue environment. After injecting sample into the lumen with a syringe, simply dip the ends of the fiber in epoxy to seal, allow to dry and then implant. 20 individual RC hollow fibers cut in 15.24 cm (6 in.) lengths available in 13 kD and 18 kD MWCO's.