Encourage more business by offering customers and visitors discounted parking with our validation stamps. The blank stamps allow you to customize to your own time interval. The validation stamps come in packs of 10 books for a total of 1,000 stamps. Each book contains 10 sheets of 10 stamps. The books are consecutively numbered for easy audit control. Similar to an envelope, the adhesive is activated by liquid. Remove the stamp, moisten and apply.