UST Magnesium Fire Starter Bar. The UST MagBar Magnesium Flint Strike Bar is a solid magnesium block with a convenient striker blade attached. The UST MagBar Magnesium Fire Starter Bar w/ Keychain includes a key chain and a striker. Specifications for UST Magnesium Fire Starter Bar: Manufacturer: UST Additional Features: Shaver/striker included Weight: 1.8 oz Length: 3.1 in Overall Length: 2.88 in Features of UST MagBar Magnesium Fire Starter Bar: Integral flint strike bar Key chain and striker included 2-Year Limited Warranty Package Contents: UST MagBar Magnesium Flint Strike Bar Tried and true the magbar fire starter combines magnesium shavings and the sparks of a flint to start the fire you desperately need. Use the serrated edge to shave off magnesium into a pile. Use the other edge to strike the flint bar and create sparks.