Handy Sized Gel Filled Pack Can be Used as Hot or Cold Compressor for Small Areas or as Hand Warmer Hot Pack in Winter. for Hand Warmer Hot Pack, Simply Place in Microwave Container with Water for 30 Seconds Until Reaching Required Thermometer. for Use as Cold Pack, Place in Freezer for 2 Hours. Easy to Use & Reusable. Instructions Included. PVC. Minimum Quantity: 100.