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Molded from premium grade polypropylene. This general purpose rack holds 50 test tubes up to 18mm in width and is ideal for use in many applications from laboratory testing to food and beverage service. Kit contains 50 black . 16x125mm polypropylene test tubes with 50 black hollow bottom caps. Rack color is CLEAR with individually numbered holes, and flat end plates for easy labelling. Disassemble for easy storage. Karter Scientific is a registered trademark in United States of America. To maintain quality control, authorized permission is required in the resale of our products. Also included in this set find, FOUR 14ml large bulb transfer pipettes.