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Sterile culture tubes are precision molded from premium-grade, chemically inert plastic materials: polystyrene (high-temperature solder) for clarity and nearly-transparent polypropylene (PP) for toughness and chemical resistance. Over fitting caps have inner ribs for two-position fits: loose for aerobic culturing and tight for anaerobic culturing and sealing with tabs to allow easy removal. All tubes are packaged in easy-to-open bags of 25 tubes each. All tubes are gamma radiation sterilized and shipped ready to use. Quality assurance protocol provides lot-to-lot uniformity, as well as traceability and reliable, consistent performance. Note: polyethylene (PE) closure only recommended to 80 C.