These Green Supreme Wood Premium Wood Pellets are high quality, PFI Certified premium-grade fuel made from a proprietary blend of wood species. Made from 100% natural, recycled, renewable sawmill residues, and manufactured at the highest quality control levels, resulting in premium grade fuel pellets. Green Supreme pellets yield a consistent, high BTU output and produce less than one percent ash. This translates to a hotter, more efficient burn and less waste to clean up.