Silver cube, which is so light and simple. Perfect for every day. - Material : Sterling silver - Specification : 4mm. Available in a pair, with 2 sterling silver butterfly ear nuts - Package : Wrap in thick ziplock for jewelry - How you preserve silver : You can wear your piece in any occasion, like taking a shower, going swimming, except going to a hot spring. The more you wear it, the more it gets shinier. Please preserve it in a ziplock. When the color turns black, use a silver polishing cloth or toothpaste to polish it.