... writing, mark, diary or others, suitable for promotion and gift. Magic Games PenTwo nibs with secret and developer inks.Could produce ... writing and markInsivible ink and developer inkAlso used for secret message and diaryCustomized printing artworkPackage:1 pc/polybag, 1000 pcs/ctnCarton ... , 40*28*31cmG.W./N.W., 10.5/9.5kgs Magic Pen, Secret Diary Pen