yoohong offers three types of biochar. There are bamboo, rice husk and mixed wood. Bamboo biochar is the best of all. Our bamboo biochar involves slow pyrolysis at low temperatures to yield more solid char materials. Biochar is useful. Many farmers use biochar as soil conditioners due to its carbon sink capability. All products are in PP bags.� Prices vary with supplies and are yet to be updated. Please check with us for the latest prices. The product pamphlet (catalogue) is available on request. Visit our website for more information.