This square hot/cold pack is made of high-quality PVC and filled with gel. Non-toxic, safe and practical! Can be used when you are injured or have muscle soreness. Our packs are filled with high quality gel that can be used as a hot and cold compress. The product is easy to use. Can be used in refrigerators and microwaves to change product temperature, and can be used over and over again. 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 rectangular pvc hot/cold gel pack 5.1 * 9 inches. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization: Logo printing available with multiple packaging and color options. Product Highlights: Portable, durable, practical for daily use.