This is one of the world's best hardwood (birch) charcoals sourced sustainably in Eastern European forests. Cooking food on charcoal is a fun process. However different charcoal will bring different flavour to your food. That’s where the tannins come in. The more there are in the wood, the more bitter and burning flavour you get. Karelian birch has 15% tannins, while most other European trees have 50-60%. So with birch we can get the food to taste just as it’s meant to. Technical Charcoal grade A, grade 1 Density, g/cm3 Not less than: 0.37 Mass fraction of ash, % Not more than: 3.0 Mass fraction of carbon, % Not less than: 78 Mass fraction of water, % Not more than 6 Mass fraction of rebrands, % Max 2 The mass of 1 dm3 of coal, g Not less: 210 Heating Level, Kcal/kg 6800 Burning Time 980 sec/cm3 Net Weight of Box (approx) 10kgs