For book sleeves, there is only one size for now:

9" x 12"

The book in reference, With A Vengance, is 6" x 9" and around ~400 pages, it fits easily into the sleeve.

This sleeve also can fit a book like Grady Hendrix's Witchcraft for Wayward Girls easily as well (6"x9" with a little over 1+1/2" of thickness)

Need something bigger or smaller? Click on the Contact Us tab at the top and let me know!