PERFECT BINDING is done by gluing gang-run off-set printed flexible pages. While this method is less desirable for color balance, strength, and durability, it is great for proof products and gifts. Best of all is the price. They are typically a fraction of the cost of flush mount and custom bound books making it the perfect choice when ordering multiple copies. There is no limitation to design or size as these books can be made to look like it was pulled off the shelf of any book store.