Cosilog is a non smokeless fuel log for open fires, wood burning stoves, multifuel stoves and room heaters. Environmentally Friendly Easy to light Attractive Flame Convenient Cosilog is an instant light, individually wrapped log made from wax impregnated wood waste. Simply place the whole log in the grate and light both ends to get an attractive, bright lively flame that can last 2 to 2.5 hours. It contains 50% biomass and produces less harmful carbon dioxide than coal. It is not suitable for smoke controlled areas. It is also an ideal source of ignition for any fire.