Coolers accomodate 0.2 to 2.0 ml microcentrifuge tubes and cryogenic vials. Blue polycarbonate lower section is available non-filled or filled with a non-toxic gel. Catalog No. 967-13861 will maintain a temperature below -15°C for up to two hours. Catalog no. 967-13858 will maintain temperature for up to one hour. Sixteen inserts (included) convert 1.5 ml holes to accept 0.2 or 0.5 ml tubes and vials.