Three kings charcoal can be used for burning your sacred herbs and resins.

How to use a Charcoal Disc. Use on a fireproof surface, such as a Brass Censor.  Light the Charcoal Disc using a lighter. Use cooking tongues so it doesn’t burn you. Once the charcoal stops smoking as much and has a red glow, add incense accordingly. Not too much or the charcoal will smother and no longer burn. 

This is for one roll of charcoal not a box. One roll has 10 charcoal discs in it.