Medline’s 50ml Racked High-Resistance Conical Tubes are made of transparent, copolymer polypropylene. The green caps are made of polyethylene with an internal liner, which ensures leakproofness.
They are DNAse, RNAse, endotoxins and metal free.
They are sterile by radiation and withstand temperatures down to -90°C (15ml) and -80°C (50ml).
These tubes are also autoclavable (the liner of the caps is not autoclavable).