Size: Grade A-B, Length 10-15+ cm Grade B-C, Length 7-15 cm Grade C-D, Length 4-10 cm Grade ABC, Length 7-15+ cm Grade BCD, Length 4-16 cm Specification: 100% Natural Wood Ash Content : 2,6% Ash Color: White/Silver Volatile Matter: 6.2% Moisture: 3-5% Calorie: 7500 Kcal/Kg 5 - 6 Hours (Minimum burning time)