These little things

I made in my jewelry class today, I plan on making the necklace I drew with them. I don't know how they are called in english but here's how I made them: I drew different size circles on a piece of copper, used the saw to cut them out, filled them a bit to make the edges better and finally used this tool to shape them. I was a bit unsure about the use of copper and brass, as I don't really wear that kind of jewelry but they are growing on me!