These are the perfect size for drinking Yerba mate. This kind of mate cup became popular in the 50's and in the last few years has had quite the resurgence. They can be hand washed with soap and water and will last for years and years.
Using a "mate" and "bombilla" is the authentic way to drink Yerba mate. It is the way it has been done for centuries.
These are reuse and recyclable. When you move on to your next mate cup, feel free to repurpose these. They are the perfect size for drawer organizer, small herb gardens and desktop.