The IsoTherm system starter set, which consists of an IsoRack (work rack), IsoSafe (insulating box), and two IsoPacks (cool packs), specializes in cooling samples effectively and consistently at –21°C or 0°C for many hours. The IsoTherm system can be used to prevent enzymes from becoming inactive as well as for PCR sample preparation, sample transport, and slow thawing of frozen samples. The rack will hold twenty-four 0.5mL reaction tubes. The white IsoPack will maintain 0°C for up to 6 hours. The blue IsoPack will maintain -21°C for up to 3 hours. All the system components can be used separately. Racks are stackable, autoclavable, floatable, and can be centrifuged in an MTP rotor. Stackable. Autoclavable. Floatable. Rack Capacity: Twenty-Four Reaction Tubes. Tube Size: 0.5mL. Starter Kit Contents: 1 IsoSafe, 1 IsoRack, 1 White 0°C IsoPack, and 1 Blue -21°C IsoPack. Eppendorf® # 022510002.