Solid fuel cubes for the Esbit Stove, the gold standard in ultralight backpacking stove systems. These fuel blocks combust at 1400 degrees and provide over 12 minutes of burn time. The fuel lights easily, does not liquify while burning, produces no ash, and can be extinguished for later use. Performs well at any altitude. These are a great option for true ultralight cooking kits, or as fire-starter as part of you emergency gear.