1:safely. Longer burning time than common charcoal, 2:No additives,high density totally carbonizd 3:common package: ... : made of 100 % bamboo or mangrove wood 2:machine made charcoal without any chemical 3:low ash,high calorific vluae about ... ,20ft about 1500ctns,40ft about 2500ctns Sawdust-briquette from extruder machine at first.Then been carbonized to the coalpit at high ...