P.I.P. Rotatory Rack is appropriate for different microtubes from 0.2 to 2ml and tubes up to 16mm of diameter. Made from polypropylene, they are autoclavable, freezable, and resistant to most of the common laboratory acids and chemicals. Their special structure and interconnections give more advantages than conventional racks. Having different sizes of wells on each side of the rack, user can connect more pieces and use tubes with different diameters and volumes inside Rotatory Rack at the same time. They are available in various colors for easy classification.