Instruct: Classify Amazon reviews into positive or negative sentiment
Query: great tool

I keep one of these in each of my emergency kits and in each car. The striker bar is protected from the elements until first use by a protective coating, scrape that off first and you've got a great handy fire starter that will last many hundreds of strikes as opposed to the 50 or so you'll get from the magnesium starters. You need a properly prepared tinder to catch the sparks, but you should have that anyway even with the magnesium starters to ensure you have a good start to light the main fire. Simply scraping up some wood shavings, or a cotton ball dipped in Vaseline and "fluffed up" works fine for either tool.