Uniheat 40+ Hour Small Pets Shipping Warmer

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. "Single" contains 1 heat pack.