It's a science sleuthing activity kit! Find and observe rocks, insects, and flowers that glow under black light, make gelatin that glows, and learn counterfeit money detection, encrypting codes and ciphers, and more. Includes 22-page activity journal and black light illuminator invisible ink pen to write secret messages, too! Details: 10" x 9.1" x 2.5" package size Includes 22 page journal with activities Write special messages only viewable in black light For ages 8 and up