This listing is for an interchangeable magnetic necklace with 8 planets, our moon and sun in the set! You can also add Pluto if you wish. Can't choose just one beautiful space discovery to love? Now you don't have to. Available in silver or bronze tone on an 18" or 30" chain. Uses a very strong magnetic combination so the nebula will not fall out of the pendant. And while you're not wearing them, let them dazzle your fridge! The pendant measures 1" (25mm) in diameter.