Dazzling Toys Invisible Ink Pen Built in UV Light Pack of 4 Magic Marker Spy Pen | Goody Bag Stuffer LET THE MAGIC BEGIN: This fun and cute invisible ink pen will write your secret message, wait a few seconds before shining the light and watch the kids jaw drop as he/she takes a glimpse at the secret spy message that is written. Have Fun! PACK INCLUDES: 4 invisible ink pens with UV lights (batteries included) each measuring 5 1/4 inches in the length. Each pack contains 4 neon colors: Yellow, Blue, Purple, and Pink. PARTY FAVOR | THEME: Perfect for giving out with party bags, Birthday gifts, Halloween ,Christmas Presents for kids and friends. Makes a promisingly fun party theme for your kids next birthday event with friends. DOODLE AWAY: Write invisibly secret messages, security markings etc. and only when you shine the light on the message you will reveal the secret behind SATISFACTION GUARANTEED: Dazzling Toys is offering a 100% MONEY BACK GUARANTEE if you are not satisfied with this!