Beside being dang cute, you could put these on a tiny axle (1mm diameter).
Note: these are unfinished, cast metal pieces (they may need to be sanded and/or have tiny holes filled in before painting or finishing).
And don't forget to wash them (just soap and water... but probably with an old toothbrush, too) to get rid of any oil or mold-release residue so the paint will stick well.
Helpful hint from Teri Calia: If you plan on painting the entire surface another color (or colors, like with acrylic paints and a tiny brush), prep by spray painting with a chalk paint.
Sold as a set of 4.