I recently received a sweet little package through the post. I ordered the Firefly firesteel when I came across it on Kickstarter. It is one of those simple ideas that you wonder why no-one had produced before. A very small, very slim ferrocerium rod that takes the place of the toothpick in a Swiss Army Knife.
Large and small Firefly inserted into the slots provided for toothpicks on my Victorinox Spartan and Classic SD Swiss Army Knives
One of these fire steels is not going to last any great length of time. Instead, they work well as an emergency carry, for those times where you get caught out for some reason, wet matches, ineffective lighter etc.
A good edge is required to raise a spark so not every tool in a Swiss Army Knife is effective. You will see me use the back edge of a saw in a Wenger Swiss Army Knife in the film below. But scissors, awl and fish scaler are effective too. The suppliers of the Firefly, Tortoise Gear, say that a can opener or file tool could also be used, however I have had less success with these. The knife can also be used but I’m not wrecking my blades attempting to do so. The back of a tool in a Swiss Army Knife can also be filed to give a good ninety degree angle for striking a steel, but likewise, I’m not butchering the tools on my knives.
There is an additional technique required when using these mini firesteels, you have to support the steel with a finger to stop it being broken. Also, strike along the thin edge rather than the wide edge, this stops it being worn away during use and no longer fitting tightly into the slot in the scales of your Swiss Army Knife.
Should you be interested, the larger 52mm Firefly weighs 1.7g , and the smaller 44mm Firefly Mini weighs a paltry 1.2g. So if you carry a Victorinox with you on trail or as an EDC, you may like to consider these. Alternatively, simply slip one into your ditty bag along with a small striker. One word of warning though, if living in the UK, watch out for those customs fees!
Three Points of the Compass 
Victorinox now has its own ferro rod and tinder bits, that replace the accessory screwdriver that threads into the corkscrew tool of the larger SAK’s:
https://www.victorinox.com/us/en/Products/Swiss-Army-Knives/Accessories/Mini-Tool-FireAnt-Set/p/4.1330.B1
It’s quite expensive but I guess it is clever. I don’t feel likely to buy it. If I’m THAT ultralight I wouldn’t bring a corkscrew-equipped knife in the first place. FWIW, am I the only one who finds that the corkscrew really needs two people to operate (one to hold onto the wine bottle, and the other to pull on the corkscrew with all their might)? For picnic purposes a lever-type corkscrew works a lot better.
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