• There are 5 warmers in this pack.
• Four warmers (up to 18 hours of heat) are individually sealed in an airtight packages to guarantee a shelf life of six years.
• Each packet measures four by five inches and provides up to 18 hours of warmth.
• Air-activated portable packets, no wires or batteries required.
• Odorless, disposable, non-toxic, and nonflammable.
• Environmentally friendly, contains all natural ingredients.
• Activation Time: 15-30 minutes; Average Temperature: 135 degrees Fahrenheit (57 degrees Celsius)

Note: The package states that expiry 012026.