Description Material: Eco-friendly Plastic (PE), Resin(inner side) Color: as picture Size: 100ml200ml,400ml Quantity:5pcs Use steps: Step 1:Open the water inlet,and add water according to the water-line on bag Step 2:To discharged air within the ice pack,seal the water inlet. Step 3:After a few minutes,the material in the ice pack and water react into a jelly-like Gel mixture. Step 4:Put the prepared ice pack into the Refrigerator freezer for 8-10hours.Then it's iced up into a ice cube. Step 5:The cooling effect lasts 10-24 hours. Step 6:Just inject water one time,and it can be used repeatedly.When it's thawed completely,it will be restored jelly-like mixture. Re-use it by freezing it. Repeat use for more than 1000 times. The shelf life is 3 years for new ice pack,and 1-2 years for used ice pack. Attentions: 1.Don't put it together with hot items. 2.Avoid squeezing or touch sharp objects. 3.Ii's not edible. 4.Throw damaged ice pack,and put far away from kids.