At the center is the sun: a 10 mm clear glass flat disc with yellow ghost (a stripe within the glass). The next planet is Mercury: a 4mm mookaite round. Next is Venus: a 6mm Swarovski rondelle in light Colorado topaz (with a beautiful AB finish). Next is the Earth: a 6mm blue-green-clear glass round with white "clouds". Finally, Mars: a 5mm red glass round.
All the planets can move freely on their orbits (except for Mercury, which needs some force to move).