Important: this coal can * not * with matches or lighter to light that would burn a maximum of the finger. I have simply placed on the ceramic hob and griddle on max. rotated. A few times and turn in up to 10 minutes glowing coal. All residues, which leaves this coal in the stove, can be easily completely wipe with a damp cloth.
Another clue: a cube is usually sufficient for a small Shisha, more than two dice I would not use even with large hookahs - is simply not necessary.