As for alloy/gold-plated products, we should pay attention to maintenance. Maintenance methods are as follows. 1. Keep away from water and sweat. If gotten wet, please dry it immediately. 2. After using, if you want to store it, please use the cotton cloth to dry it. And you had better put it in a separate sealed plastic bag. Important Shipping Information: Please kindly be aware that item is from China and it may take 7-15 days to arrive. If any questions, please feel free to contact us. Due to manual measurement, it maybe cause the deviation.