This is not a toy and is not intended for small children (Potential choking hazard). Adult supervision is highly recommended for children and expert advice for the bigger kids!
These Rods are approx. 8mm by 80mm. They have a gold coloured covering. Thousands of lights! When you scrape them with a piece of hard steel such as knife, hacksaw blade, or even a key, these emit long lasting sparks of over 3000 degrees. You could of course make your own customised handle for the blank!
When the rod is struck against steel, or vice versa, a spark is thrown. Tinder can be used to catch the spark; it should be shredded up and unravelled and formed into a sort of nest, cotton wool also works very well. Put more kindling on top as it catches alight and you can build a fire from there.