Firewood that is processed into better than firewood made from 100% Douglas fir wood chips and saw dust . Compressed at a super high compression. NO GLUES just pressure of aprox 400 tonnes of pressure only 4% moisture so burns so much more efficiently than firewood and because it's 3x more dense it gets you 8 hours of heat when you stack 4 bricks on 4 bricks tightly together. 50 packs is more than 1/2 cord in heat value but only uses 1/4 cord of space. If your new to his and would like to try them first I have 3 locations that sell them over thier so call me for info on that and any other questions I'm almost ready to come over soon as I need to have a full truck load to come over from Vancouver Island . 250-741-7872 Jay