A %%ot [ter'angreal|Angreal]%% in the form of a thin leather strap with steel weights at the ends. When wrapped around a book and the weights locked together, it renders the book invisible. 

! References (Possible Spoilers)

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# In [The Gathering Storm]
## [TGS,Ch39] - [Verin] gives the bookstrap to [Egwene] along with her journal to keep it secret.
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