The Maratac Split Pea is a tiny version of the popular Peanut lighter. It is constructed of brass, with a threaded and o-ring sealed cap so you can store it for a long period of time without the fluid drying out. These lighters use standard liquid lighter fluid that you will need to add on your own. Great survival and everyday carry lighter that won't weigh you down.
To piggyback off Micah's review, I've found that if you actually remove the black rubber o-ring that comes with it, and simply screw it closed real, real tight, it will retain fluid for months and months, like it's supposed to. For whatever reason, the o-rings aren't a great fit and can cause fluid to evaporate too soon. Still gave it 5 stars because it works great, minus o-ring
I have both the cheap chinese knockoff of the pea lighter and this split pea. I have noticed that actually the chinese one retains its fluid, and this one loses it within a week. The chinese one has lit for 3 months and still going.