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These are actual glow in the dark bubbles. They look so cool, I want them! It looks like it would be fun using this! They glow when they are exposed to UV light. They are also cheap, they`re around $8.00 on http://www.thisiswhyimbroke.com I`m not exactly sure on the price but they are under $10.00
Source link: http://www.thisiswhyimbroke.com