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Secret writing set that allows you to write and record secret messages in a lockable diary The invisible ink pen only shows up under ultra-violet light, such as that from the UV torch included Set includes diary, padlock, key, invisible pen (with 2 x refills) and a UV torch Diary is approx. 14.5cm, batteries included, packaging dimensions are W18.5cm x H23.5cm x D2cm All TOBAR products are rigorously tested and certified safe to the highest EU and UK standards