Tried to get them to work but no luck. You have to hit the surface / push VERY hard to make it flip. I wouldn't trust him in an emergency. I bought them and they work MUCH better: https://www.amazon.com/LifeHammer-Safety-Evolution-Emergency-Ceramic/dp/B00M0S6EQO/ref=psdc_15736681_t3_B000BMWXZM
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