New Designer Hand Warmers - Cat Pattern, Nordic Pattern Disposable Disposable hand warmers made by a fabric shop with popular designs. My daughter wanted cute hand warmers, so I bought too many, and I'm selling them while they're still new! The following is a quote from the internet: Duration: Approximately 17 hours (maintaining a temperature of 40 degrees Celsius or higher) Maximum temperature: Approximately 72 degrees Celsius Average temperature: Approximately 52.9 degrees Celsius *There may be slight variations in the time and temperature displayed when used on the human body. These are disposable hand warmers. Do not use for any purpose other than their intended use. SIZE Approximately 13.5 x 10 cm MATERIAL Ingredients: Iron powder, water, vermiculite, activated carbon, salt, absorbent resin