This design is a former freebie sticker from Halloween 2023. You can still pick it up for $$ if you missed it, or just want extras!
These stickers are glossy glow-in-the-dark vinyl so they'll glow a bright green in the dark! They're super tough and fully waterproof - good for 2-4 years even in harsh conditions! Feel free to stick em on a notebook, water bottle, console, laptop... even your bike! I dunno, do whatever!