2023-07-21 Reversible Racks for Microtube, Polypropylene, Manufactured in Heavy-duty Polypropylene; One side is designed to hold 1.5ml/2.0ml tube, the other side holds 0.5ml/0.7mltubes; Racks are molded numbered on the surface for easy samples identification. ; Idea for Freezing*Temperature range -80°C to 121C.