The Secret Decoder set, +7 years, Melissa&Doug This set of decoding clues and secret messages is an exciting experience for any aspiring spy. It contains three workbooks, each dedicated to a different spy technology. Characteristics: Decoding Ring Notebook: Here, young spies will learn the secrets of the art of decoding secret messages. The decryption ring will allow them to reveal hidden information and decipher encrypted clues. Secret Clues Magnifier Notebook : This notebook will train them to become real detectives, using the magnifying glass to find hidden clues in texts and images. They will learn how to discover things that are not visible to the naked eye. Pen Notebook that Writes Secret Messages : Here, budding spies will learn the art of secret communication. With the help of the special pen, they can write and read messages that remain invisible to the ordinary eye, developing coded communication skills. Specifications: Package dimensions: 25.5 * 6.5 * 2.5 cm.