Transport tubes, sometimes called mailing tubes, are used in multiple sectors of the laboratory market, including environmental, independent testing, food testing, and biological research labs. PekyBio's transport tubes are made from polypropylene (PP), and screw caps are Polyethylene (PE). Tubes are self-standing with conical bottom and molded graduations. Vailable in 5 mL and 10 mL, non-sterile and gamma radiation sterilized.