Our sawdust pressed firelog are made from tightly compressed 100% pure wood sawdust, without the addition of waxes, chemicals or other additives. Pound for pound, these give even more heat than natural firewood. 8500 BTU per pound in comparison with 6400 BTU for natural wood. They can be used in fireplaces, woodstoves, inserts, and campfires. All in all, these firelogs give all the heat and more of natural wood, and have the convenience of popular wax firelogs. The environmental benefits are that these firelogs are made from 100% recycled sawdust, no new trees are cut, they leave little ash and give off few polluting air emissions. appearance: is tetragonal bar of about 45mm diametter 400mm in length with a central hole. Moisture: 4.5%, heat value: 4800kcal/kg