Safe for direct contact with food - Made from high-quality PE material, enabling safe direct contact with foods. Reusable cooling performance - The cooling packs are made of sturdy PE material and can be reused while maintaining their cooling performance. Six blocks in one set - Includes six ice blocks to meet your daily and special occasion cooling needs. Easy to use - Fill water into the ice crystal box up to the scale line (do not overfill), wait three minutes, and then place it in the freezer. After 3-6 hours of freezing, the ice pack can transform into a larger block. Practical packaging - Six ice blocks in a single set provide flexible cooling options for different scenarios. Usage scenarios - Lunch boxes and meal prep: keep lunches and beverages cold at work or school. - Outdoor activities and travel: maintain cold items during picnics, trips, or shopping excursions. - Groceries and temperature-sensitive items: help preserve cold items and other temperature-sensitive goods during transport.