The Brass Flint Wheel is used in survival tins and is extremely compact for EDC gear. You can now easily ignite tinder and other flammable goods for camping and survival needs.
This is my second one. It's small enough to keep pretty much anywhere. But this one is going in my cook kit.
I bought these to use on some homemade brass lighters. Have not had time to use them but they are well made and I think they will work perfectly for my projects.
It doesn't leak in your pocket, doesn't run out of batteries, and refills won't break the bank. And it's brass. What more do you want?