... standard: smokeless, non-toxic, tasteless, surface looks smooth and flawless. Machine-made CharcoalExport Grade-A charcoal quality standard: smokeless, non-toxic ... of metal steel when charcoal knock charcoal, good hardness, specific gravity:1.3-1.5, length:10-35 cm, diameter: 3 ... of metal steel when charcoal knock charcoal, good hardness, specific gravity:1.1-1.2, length:8-35 cm, diameter: 3 ...