Sterile, Polypropylene Cryogenic VialsSterile, Polypropylene Cryogenic Vials Non cytotoxic and non pyrogenic Nalgene, linerless seal ring system External thread provides no risk of contaminating contents of vial Self standing without a holder; conical bottom allows complete sample retrieval Deep skirted closure allows single handed aseptic technique without exposing fingers to vial contents White marking area, fill line and graduations printed on vial Specially designed case for