Description General description Self-standing non-sterile tube made of polypropylene. A tamper evident sample and transport tube design. They are ideal for all applications requiring a tamper evident seal in order to guarantee the utmost security and where sample integrity is of high importance. These unique transport tubes incorporate a seal that needs to be broken in order to open it, which leaves an obvious visual indication that the vial has been opened. Manufactured from non-toxic polypropylene, these tubes provide strength and clarity and exhibit some unique design features. Five sizes are available from 5 to 30 mL. All graduated tubes are in 0.5 mL increments. They have external threads to provide a smooth and uniform inner surface. Caps should be ordered separately.