product specifications: 1. maximum ash content of 2.5% 2. maximum humidity 5.6% 3. volatile gauge 12% 4.refining carbon 80-90% 5. calories 7000-8000 kcal 6. clean white ash color 7. Good accessibility 8. burning time 120 minutes 9. 3x1 meter drop test 10. no smoke, no smell and no chemical ingredients.