2mL Cryovial Tubes with internal thread. Polypropylene. Temperature Range: -196°C - +121°C. Leakproof seal design with external thread cap. Sealed cap. DNAse, RNAse, and Pyrogen free. Sterilized by gamma radiation. Max working volume: 2mL. Self standing. Cap has leak proof O-ring seal. Packed in tamper proof zip-lock bags. Sterile. BSE/TSE free.