These 12mm hoops have a click closure that is easy and secure. They look like earrings worth a lot more because they are so well finished with top quality materials. This is cubic not crystal which scratches and gets dull. The cubic is a much higher quality and keeps it's shine. The gold plate is on sterling silver unlike "gold filled" jewelry which is a thin plate of gold over toxic base metal. Our jewelry never creates allergy because our quality control is impeccable.