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The Ultra-Light Mini Stainless Steel Pocket Hand Warmer is fueled by lighter fluid. It's very economical due to low fuel consumption. It has high heat output making it ideal to use in extremely cold places. Platinum catalysis lets it burn clean and safe without any flame. Lightweight and compact, you can carry it anywhere. Great to use indoors or outdoors. Suitable for cold protection when skiing, hunting, mountain climbing and camping.