Self-standing, polypropylene tube is ideal for applications requiring a tamper-evident seal, as well as for transport, freezer storage, and boiling. Printed graduations and white marking areas for sample identification. Sterilized by gamma radiation. Screw cap features an innovative tamper-evident locking ring, leakproof O-ring seal, and a flat top for writing and packaging applications. Caution: Do not use for storage in the liquid phase of liquid nitrogen. Packaged in tamperproof resealable bags. Caps are supplied slightly screwed on. Certified RNase-, DNase-, DNA-, and pyrogen-free.