Bought this in Tokyo Hands. It's v. light, some sort of porous ceramic. the well in which you are supposed to put something to burn is about the size of one of those Friends-style coffee mugs--perhaps slighly bigger. A small metal grill sits on top.
I live in an apartment with no balcony, and my mother has just informed me that a small handful of charcoal will not do, as it will give off carbon monoxide. So what should I burn in it instead?