Dry grass, cotton wool, leaf skeletons, theoretically feather sticks, maya dust, paper, cotton lint from the drier, meths, petrol (but that would be really stupid), charred wood, wild cotton heads, clematis fibres, fibrous seed pods.
Lotsa stuff.
I was going to say I've lit a feather stick with a ferro rod, did it for the fist time this week end.Theoretically? Practically, more like! It only takes a bit of practice.
i have been told hexi box can be used with a fire steel