Eppendorf Rack with square wells is designed to hold 1.5ml & 2ml microtubes. It is made from polypropylene, is autoclavable, freezable, and resistant to most of the common laboratory acids and chemicals. It has alphanumeric grid for easier retrieval. The advantage of this rack is the ability of being folded and unfolded when necessary in order to save space and put a large number of them in autoclave.