These gel packs are filled with high polymeric compound power which is clean, non-toxic, safe and eco-friendly The powder inside bag will rapidly absorb water and become gel that has certain elasticity and used as refrigerant Water inlet is designed with self-sealing structure so gel will not flow out Easy to carry, convenient to use, reusable, not easy to damage, concise, beautiful and quite practical Instructions:1. Open the ice pack inlet seal.2. Fillwater and exhasut the air.3. A few seconds after injecting water, the material in the ice bag reacts with water to form a gel.4. After being frozen in the refrigerator for 10-12 hours, it can be used.Specifications:Material: PECapacity: 200 ml, 400ml, 600ml Size: 200ml: 15*10cm /5.9*3.93" 400ml: 20*12cm /7.87*4.72" 600ml: 23*13cm / 9.05*5.11" Note:1. Do not exceed the maximum water level during water injection to avoid water leakage.2. Do not heat it, do not come into contact with hot objects.3. Not edible. If it is damaged, please give up to use it. Package:10 x Ice Pack with 200ml