We have invested in our own factory so we maintain every step of manufacturing and quality control process. Our factory located in Yogyakarta, Indonesia. this is our Product Features: content: 100% coconut shell charcoal Ash Content: 2.1 - 2.5 % Ash color: White Grey Moisture: 5 % max Fix Carbon: 80 % Min Strong, Does not Crack Easily Calorific Value 7500 Kcal Burning Time: 2.5 hours support: MSDS ( Material Safety Data Sheet)