The pellets ESTABIT It still confuses with older pellets META. The meta, now banned, is methanol (or "wood alcohol" CH4O) solidified, not to be confused with ethanol (or ethyl alcohol liquid still C2H6O), natural component of alcoholic drinks and that we do that commonly can buy denatured. The ESBIT is methenamine formula C6H12N4. The package recommends prudence on inhalation (gas, dust) and epidermal contact. I appreciated the meta. I hate esbit. I prefer the liquid alcohol (methanol or denatured ethanol) which has the disadvantage of volume but has the advantage of operating at all temperatures