Let's face it, earring backs are very easy to lose. Get a couple or these spare pure titanium earring backs to have on hand just in case COMFORT: Ultra lightweight and hypoallergenic, you will not need to sacrifice comfort for style. Even people with extremely sensitive ears will find these earrings so comfortable they may even forget they are there! SAFETY: These pure, medical grade titanium earrings are made specifically for sensitive ears. If you have sensitive skin, sensitive ears, or metal allergies, these hypoallergenic earrings are for you. Made of pure titanium, these earrings will not cause a reaction with the skin PURITY: 100% Nickel Free and tested for purity in our labs WATERPROOF: Can be worn in the water without the risk tarnishing or turning green