... section tidy, a very refreshing sound of metal steel when charcoal knock charcoal, good hardness, specific gravity:1.3-1.5, ... -92%.Export Grade-B charcoal quality standard: smokeless, non-toxic, tasteless, surface looks smooth and flawless, no explode, fire quickly, burning time ... tidy, a little bit refreshing sound of metal steel when charcoal knock charcoal, good hardness, specific gravity:1.1-1.2, ...