The 'different style on each ear' earrings are one of biggest trends in South Korea right now. They are so different from our standard way of wearing earrings. At first, I was umming and aahing about these but they soon found a spot in my heart, now I wear these regularly and get so many comments! They are strong enamel and gold coloured Zinc Alloy. I have sensitive ears and I have never had an issue with them.