Unleash the mystery with our ballpoint pen set! Perfect for fun parties and family gatherings, this invisible spy pen is a must-have for little detectives. Let the adventure begin as you write secrets that disappear into the unknown, only to be revealed by the UV light on the pen cap. Harmless and odorless ink ensures the health and happiness of young detectives. Ideal for children's birthday parties, treasure hunts, escape rooms, or as Valentine's Day gifts, these pens offer endless creative possibilities. The package includes 12 pens with built-in UV lights and batteries pre-installed for convenience. Inspire creativity in classrooms with invisible ink clues and engage students in exciting activities. Suitable for children over 3 years old, this pen set is a perfect addition to surprise gift bags or children's stocking fillers. Embark on a journey filled with intrigue and fun, where secrets come to life beneath a captivating veil! Item Name: Ballpoint Pen Material: Plastic Features: Invisible Ink Pen, Washable, Multifunctional Size Details: Length: 13cm/5.12" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 12 x Ballpoint Pens