Single wood - eucalyptus. Absolutely 100% natural. You can slow global warming using this product. Carbon neutral. Zero fossil fuel. Made from a totally renewable resource. No anthracite. No hard coal. No borax. No sodium nitrate. Environmentally friendly. Exclusive design. The green way to light your green hearts. This product complies with South Coast Air Quality Management District rule 1174, ref. C12. Reduce your carbon footprint. Green Hearts carbon neutral cycle. Green Hearts Natural Charcoal Briquettes are a carbon neutral source of energy. Green Hearts are made of eucalyptus trees. While growing, eucalyptus trees have the ability to soak up carbon and release oxygen. The carbon that is soaked up by eucalyptus trees compensates the carbon that is emitted while grilling food using the briquettes You can make a difference using clean energy when you BBQ. Once the eucalyptus tree is harvested, it is then crafted into charcoal in traditional ovens. This pure natural charcoal is mixed with natural binder to make Green Hearts. This unique dimpled heart shape briquette burns longer than other briquets to sear in the juices. Green Hearts Natural Charcoal Briquettes are for people who love natural, grilled or smoked food flavor. Tested in a kettle grill by an independent laboratory. Environmentally friendly. Exclusive design. Soler Family guarantee: Zero fossil fuel. No saw dust or remnant wood used. No fillers. No borax. No hard coal. No anthracite. No petroleum by products. No sodium nitrate. No artificial lighter. Say no to greenhouse effect gases. No eucalyptus odor. Made in Brazil.