Big Green Egg is committed to eco-friendly and natural products what else would you expect from a company whose middle name is "Green". Big Green Egg painstakingly sources our natural charcoal to ensure that it contains no fillers, nitrates, chemicals, anthracite coal, limestone, treated wood or petroleum products. Unlike some of the other charcoals and briquettes on the market today, pure and natural Big Green Egg charcoal is premium carbonized wood with no additives whatsoever.