Medicine caps with a message: "Not for lock flush" ... "Paralyzing Agent" ... "Must be diluted" ... and "Warning: Paralyzing Agent."
The red, turquoise, brown, and black caps are 22 mm in diameter; some black ones are slightly smaller, about 20 mm. There are a very few small green tops, about 15 mm.
In bright colors of turquoise, red, black, and brown, the assorted sizes and colors sold by the ounce (about 60 pieces).
Whether you're cranking out badge reels for friends or a fundraiser, or ready to move on to a more ambitious project -- such as a mosaic (see https://www.treehugger.com/culture/toronto-nurse-turns-medical-waste-stunning-mural.html) -- these will get your creative juices flowing!