Coconut charcoal is 100% natural hookah charcoals and is made from compressed coconut shell. Tasteless and burn up to 60 minutes. You can light these coals on a stove top or an electric coil burner. The first thing to notice whether the charcoal cubes are good or not is the smell when you put them on stove or coil burner. If you smell carbon monoxide, do not bother using them. They will be fine after they fully burn to red, but definitely they are not the best. Now when you place them on head, it should not turn black, it should stay red.