Tourniquets work well when traveling overseas when you can't get seem to find good rubber otherwise. They aren't tapered, but thin and cut about an inch wide, good to go, and pretty standard everywhere in the world. They're available at medical supply stores and sometimes pharmacies. It's seemingly always better rubber than what natives use and sell with their slingshots in every country I've been to. I've seen latex and exercise band material, and both are good. Something to keep in mind if you get around.