Mangrove Lump Shape Charcoal, size B2 â?? B5, Length: B2 15 cm. up, B3 10 cm. up, B4 5 cm. up, B5 3 cm. up. Specification: Heating value: 7200-7500 Kcal/kg Ash content: 4% (Max on Dry basis) Fixed carbon: 70 - 75% Moisture: 3-5% Burning time: 3 â?? 3.5 hrs. No smell, No spark, No smoke