Give secret messages to your friends with the Invisible Spy Pens. This 4 pack pens feature invisible ink that can only be revealed using the UV black light in the cap! Simply write a message with the invisible ink pen, then light up your message with the mini UV light to see what was written down. Perfect for trading secret messages with your best friend!
- 4 pack pens
- Fun for all ages
- UV light in cap of pen
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