These are similar to the Fickle Fire units sold by Japanese pro magician and dealer Yutaka Kikuchi c. 1976.
You have a unit for each hand, load them up with lighter fluid and to use them you just open up the cover with thumb, turn flint wheel and your hand is full of fire. To extinguish the fire you just shake your hands and the covers close and cut off the oxygen to the fire and they go out almost instantly. They both need new flint, easily installed. None provided, they were shipped from Sweden that way!