This rounded corner hot/cold bag is made from high-quality nylon and filled with gel. Non-toxic, safe and practical! Can be used when you have an injury or sore muscles. Our packs are filled with high quality gel that can be used as a hot and cold compress. This product is easy to use. Can be used in refrigerators and microwaves to change product temperatures and can be used repeatedly. The interior is filled with a non-toxic, flexible mixture of water and glycerin. Perfect for nurse offices, workplaces, homes, and more. We can print your logo on the outside of the product. Measuring 5.1*9 inches, this custom multicolor rounded corners square hot/cold gel pack. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: Portable, durable, practical for daily use.