Charcoal discs are great for burning herbs or resin as they last up to an hour or longer.  They are chemical free.

Pack contains 10 tablets.

To Use:

Remove a tablet from the sealed roll and place in a heat proof dish.
Light the edge of the tablet with a match or lighter and sprinkle incense or resin on. 

Warning: Once the charcoal disc heats it up, it will "sparkle".