FreezeCell, Square Shape, Holds (12) 1.0-2.0mL Cryogenic Vials or 1.5-2.0mL Centrifuge Tubes. The FreezeCell™ can be used with a variety of cell types, including stem cells, primary cells, cell lines and yeast. The FreezeCell™ doesn’t require any additives, all you need to do is place the FreezeCell™ into an ultra-low freezer, and the cooling will begin at -1⁰C per minute. It is a very good device for all protocols of cell preservation. This product is symmetrically designed with a combination of foam and alloys with no additives or emission characteristics. These products are environmentally friendly. No Need to replace any parts, and will serve you for years.