This FN-45 “Tin-O-Darts” is a seamless 2-1/2" pressed tin containing 30 gleaming stainless-steel Book Darts. They’re paper-thin and unobtrusive, but easy to find. They cling tightly to the page, but are easy to apply and remove without causing damage. They’re strong and reusable, so that seems like a lifetime supply. But maybe you better pick up a couple tins, because you’ll find yourself giving them to curious friends — or leaving them to point at a particularly poignant passage indefinitely. You’ll find all sorts of uses for them.