Function:
1. size 29*18cm; material: PE&NYLON; weight: 400g       
2. when using, this product can supply cold environment without outer source                  
3. non-toxic, non-caustic, reusable

Use manual:
put it in the freezer for 12 or more hours before using

Application:
1. transportation: used in long distance refrigerated transport for all kinds of biology freezing reagents, medicine, blood plasma, bacterin, seafood, poultry and fresh food.                                       
2. daily  life and camping:  cold reservation and electricity saving                               
3. Medical treatment: defervesce, diminishing inflammation and easing pains, hemostasis and physical therapy and skin care.                                                                                    
4. Sports: accident injure, wrench and in training and matches