For example, they come in a bag and have different light patterns. Now that we unfortunately had to use them I can say they were very useful, the cop thought they were pretty cool. I wanted them to be lighter. Accident in pitch black darkness and in the rain. After the first use, one of the plastic hooks on the back broke off. Of course, that doesn't stop you from using them since we had them on Earth. It takes two (6 pucks) to really mark your location.
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