I have used some of these to light some resin casts. I like them because the wires are small enough to hide, the lights look more like fireflies than big ol' LED lights, and every component is hot glue resistant. I wouldn't put them in resin but they work very well as backlights. The battery won't last very long, but it could be replaced by someone who sees small things better than me. They're perfect for something like a party, where their sparkle at the end can be a great way to signal to your guests that they've been there for six hours and now have to leave.
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