The Secret Message Spy Gear set includes a multifunctional spy pen, a decoder wheel, a Spy Ninja notebook with pencils, and pre-written secret messages. The pen features a standard ink tip, an invisible ink marker, a hidden compartment for messages, and a built-in UV light to reveal concealed writing. If the invisible ink marker dries out, users can revive it by turning the marker upside down and running it under water for five seconds. After recapping, allow it to sit for ten minutes before use. The set is manufactured in China.