Features: 1High-Grade Material: This Lunch Ice Crystal Box contains dry ice crystal particles the particles are coarse and has good expansion. The cold storage effect is strong. 2Easy to Use: Ice crystals in the Ice Pack for Lunch Box will expand during the process of absorbing water and freezing so do not fill up when adding water you need to reserve a space. 3Long-Term Use: During the expansion process of the Ice Pack for the Air Condition Fan if the ice crystal liquid overflows it can be used continuously after cleaning. With a long cold storage effect it can be used repeatedly. 4Wide Range of Uses: The Refreezable Ice Pack is suitable for food refrigeration breast milk preservations air conditioning fan ice crystals nursing and cooling barbecues self-driving refrigerated transportations etc. 5Suitable for Lunch Bags: After receiving the Ice Brick Pack you need to add water to use it. After adding water the ice crystal particles will expand. After the expansion put it in the refrigerator for about 2-4 hours and then take it out for lunch bags. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Material:PE Size:15.8*4*4CM includes: 1*Ice Crystal Box