Magnesium Fire Starter Black Multi-function Outdoor Emergency Survival Camping Tool Flint Rod Firestarter w/ Iron Striker Best multi-functional fire starter tool for outdoor survival. Magnesium flint rod measures 38 x 8 mm. Light-weight, compact, and easy to carry. Fireproof, water-resistant, and shatterproof! This high quality firestarter can be used thousands of times.