These Secret Writing Pens Come With A Built In Uv Light Torch At The Top That Instantly Reveals Hidden Messages Making Them Exciting For Kids And Fun For Creative Projects. The Invisible Ink Is Perfect For Sending Secret Notes Playing Detective Games Or Adding A Surprise Element To Crafts And Cards. Each Set Includes Pens In Vibrant Colors Such As Yellow Pink Purple And Blue Decorated With Charming Designs That Make Them Visually Appealing. Safe And Easy To Use These Pens Are Ideal For Birthday Parties Return Gifts Classroom Activities Or At Home Fun. Compact And Lightweight They Combine Creativity With Entertainment Offering Endless Playful Possibilities.