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More details1. Non-woven fabric is non-toxic, pliable and breathable. It prevents ice blanket from being torn or ruptured. 2. The poundage of internal polymer is six times more than water with same volume. So it works longer than general ice, Techni ice, Cryopak. 3. Lightweight. One frame weights 1.5g / cell before soaking, 100g / cell after soaking. Dimensions: 2.3 x 3.6-Inches. It is good to save more space and more money during the cold transport. Better used for: Transport foods and seafood, perishables, medicine, vaccines, fresh beer, beverages, pain relief in cold therapy. Using Method: FirstSoak fully in water about 3-5 minutes.SecondTake out from water, rest for 1-2 minutes before freezing, dry the water on plastic side.ThirdFreeze for 6-10 hours.