A good way to mark key cards in a deck. Aces, for example, so that you can always spot them quickly
in a ribbon spread. If you're into gambling routines, this is an inexpensive way to familiarize
yourself with this classic method. For what it's worth, the majority of hustlers over the years
haven't been mechanics. They've been paper players. David Malek's Juice decks are also excellent,
even though some have complained that it's hard to read the marks. (Which is the point, of course.)
For those wanting the work to be especially heavy, all you'll need is "Juice" and a Q-tip. (And
good health insurance, should you dare to cross the line.)