UniHeat Shipping Warmer 40+ hours heat pack

Uniheat 40+ hour shipping warmers are the first warmers designed especially for small pets, tropical plants and other temperature sensitive products. Simply remove the outer packaging and expose the warmer to air to activate. Preheating before usage is not necessary. Contents: Iron powder, water, activated carbon, vermiculite, wood powder and salt. Features & details Designed for reliable and steady heat release for 40+ hours Simple to use and deliver optimal results with color indicator on the warmer Excellent for shipping live insects, reptiles, tropical fish, flowers, etc. Provides an average warmer surface temperature of 100 degrees Fahrenheit (38C) Environmentally Safe For best results it's important to open your shipping warmers well ahead of your intended pack out time.  This will give you amply time to make sure they activate properly.  During this time it's important to make sure your heat packs are properly staged as well.  We've found it's best to all