Grabber warmers offer superior, all-natural, portable heat and are standard equipment for anyone who enjoys outdoor activities when it&';s cold outside. Warmers are air-activated, no shaking or kneading required; just open the package and allow a few minutes to start the process. Grabber Warmers are dry, clean, odorless, non-toxic, non-flammable and designed for one-time, disposable use. The hand warmers fit easily into your glove or pocket keeping hands & fingers toasty for up to 12 hrs of warmth.