Mangrove charcoal briquette. Hexagonal shape diameter 1.8 inches with length 4 or 5 inches. Burning duration : 3 hours up Strong. Not easy to break. Able to reuse after putting water to stop fire. No smoke, No smell, No spark Specification: Heating value: > 6000 Kcal/kg Ash content: < 6% Fixed carbon: > 60% Moisture: