call it fat wood,lighter wood,lighter knots,pitch stobs and vast other names depending on location you live. but its basically resin soaked evergreen chunks of wood. its natures gasoline/kerosene/diesel fuel i have started 1000's of fires in cascade mtns on rain with pitch stobs. be warned dont toss a large hunk on a fire...you will stand back and it will be a large fire.guy i worked for part of crew was complaining about it being cold,raining and spitting snow on lunch break. he tossed one on fire that was already going and it wasnt long till it was a roaring fire.they like to never put it out to go back to work...lol...a little goes a long way.