This set of one pink and one blue Eppendorf iceless cold packs reliably cools samples for more than an hour at 0 degrees C when precooled for 2 hours at -20 degrees C. Temperature safety is indicated by a color change when temperature is exceeded. The pink pack turns violet when ice cold. The light blue pack turns dark blue when ice cold. Both packs return to their original color (pink or light blue) when temperatures are above 7 degrees C. The special cone contour prohibits freezing of samples. These space saving cold packs are superior to an ice bath and keeps samples safe from contamination. It can be used for the protection, transportation and storage of sensitive samples, as well as for safely stopping reactions. It is designed for use with 0.2mL and 0.5mL reaction tubes/PCR tubes, tube strips and 96-well PCR plates. Set Includes: 1 Pink and 1 Blue Iceless Cold Pack. Capacity: 96-Well Plates or PCR Tubes. Tube Size: 0.2mL and 0.5mL. Temperature Maintained: 0 degrees C For One Hour. Precooling Required: 2 Hours At -20 degrees C. Color Change Temperature: At 7 degrees C.