MicroTubes are made from a fluoropolymer, fluorinated ethylene propylene (FEP). FEP is highly inert and retains its integrity within an extremely wide temperature range (-200C to +100C). MicroTubes hold 50 - 150 microliters depending on the cap used. MicroTubes are used with MicroPestles for tissue homogenization. Racks are reusable and can be refilled.