4M Spy Science Secret Messages This kit introduces kids the intriguing spy world practices of secret communications and recording evidence, all in the name of fun. A real spy training pack, this kit will teach kids to encode with concealed secret messages and communicate in many different top secret ways. The eight useful spy tools include: Super Spy Journal, X-ray Secret Notes, White Invisible Message Writer Pen, Black Message Developer, Secret Code Library, Morse Code Shutter Torch, Cypher Wheel, and Super Spy ID Card. Scientific toys like this product encourage imagination and critical thinking in children. Recommended for ages 8 years and up. Challenge your child's imagination with 4M toys and kits. 4M educational toys cover a wide range of educational subjects and include science kits, arts and crafts kits, robotics kits, and more. 4M offers a wide range of toys and kits to let you build a clock, crochet a placemat, or turn your room into a planetarium--all in the name of making learning fun. Kit includes invisible markers, a 20 page super spy journal with a secret code library, and much more Write on X-ray secret message sheet, which can only be decoded with decoder lens Inspiring, creative, imaginative, fun