SneakyBooks Recycled Hollow Hidden Flask Book Diversion Safe, Pack of 4 (Flask Included) We're saving used, hardback books from the shredder! Best value. Set of 4 books Stainless Steel Flasks are Included. Hand crafted in Seattle, Washington. Titles of books will be different. Makes for excellent gift! Hollowed out from a real recycled book - great gift for co-workers, friends