Set 4 is Earrings. I use hypoallergenic earring hooks. You get to pick your colors. If you want a character on it or something is fun or just want something that's gonna shine. You could pick if you want small stones big stones or this particular shape that you like. If you like studs or dangling. Tell me a little bit about what you like. I will take it from there. All sets come with keychains.