Saw-cut copper rings.
Wire thickness 0.8 mm, inner diameter 2.8 mm, AR 3.5.
ca. 500 rings per package.

These rings are patinated, that means they are darker in color then usual.

By cleaning them, they regain their old shine and color. Cleaning can be done by rubbing with a mild acid. Diluted vinegar on a sponge works fine, though any mild acid (lemon juice, ketchup, brass polish) will do the trick. Rinse afterwards with plenty of clean water to remove the smell.