Johntoy secret notebook with pen Obviously, the information you collect as a detective must remain top secret. Write your text with invisible ink in this notebook. With the special lamp your texts will be visible. The booklet is of course also provided with a padlock. Specifications: Colour Black Gender: Junior Material: paper / plastic Size booklet: 14 x 10 x 3 cm Age: from 4 years Content: 1 Notebook with padlock 2 Keys 1 Secret pen