New flint stone containing magnesium block.
Multi function: ruler, bottle opener and sawtooth.     
Safe, convenient carrying and durable. Can be used for hundreds of times.
Start fire easily and quickly with just some spark.
Can be used in most weather or low temperature.
Suitable for military, hunting, fishing, camping and other outdoor activities.
A wonderful survival tool.

Material: Rare metal & magnesium
Color: Silver
Ruler length: 7.5cm / 3.0in
Flint stone length: 7.5cm / 3.0in
Magnesium stone size: 7.5 * 2.7 * 0.9cm / 0.3 * 1.1 * 0.4in
Magnesium stone weight: 43g / 1.5oz
Package size: 20 * 12.5 * 2.2cm / 7.9 * 4.9 * 0.9in
Package weight: 80g / 2.9oz

How to use:
Step 1: Scrape off some shavings from the magnesium part.
Step 2: Accumulate magnesium shavings into a small pile and place next to tinder (paper, leaves, small twig, barks, etc).
Step 3: Ignite shavings with built-in sparking insert.