A pack of 12 solid fuel refill  sticks for pocket handwarmers.

These are the charcoal sticks which you ignite and insert into a handwarmer, the type which looks like a glasses case.

Comes with instructions on the packaging, but these are really simple and easy to use, and fit any of these kinds of handwarmers.  

Provides heat for hours.  The brand name is a good one, 'Highlander', but will fit any type of the above hamndwarmers that burn solid fuel sticks.

Thanks for looking!