In their simplest form, these are just coal dust that's compressed into a briquette shape. Usually, though, they're loaded with a bunch of other stuff: limestone for coloring, sawdust as a filler, borax as a release agent, starch to help bind everything together, and a few others. Available in Hexagonal and Pillow Briquette variants Ash: 8 to 10% Moisture: 10 to 12% FC: 75 to 78% Burning time: 4 to 5 Hours
