Pennington Fuel Pellets are all-natural, premium options for running your stove.They’re a clean-burning, long-lasting product that leaves behind very little ash. These Pennington Nature’s Heat Pellets take the renewable resource of sawdust and wood chips and turn them into fuel pellets that are clean and easy to transport and store. This product sustainably heats homes across the country. It’s made from a renewable resource, and the manufacturer is a member of the Pellet Fuels Institute.