This product uses surface anti-allergic protection, when you wear it, you will have any allergic reaction. It can make you more noble. The material of this is copper inside and Vietnamese sand gold on the surface. When worn, the product can keep the color bright for a long time without fading. Please do not place in strong acid or strong alkaline liquid, it will damage the bracelet. 1.good quality 2.competitive price 3.fast delivery 4.quick response.We accept Paypal.Delivery is scheduled within 48 hours after payment notice.We ship out all item via Express.We have very good warrant and return policy. If you have any question, please contact us,we will reply as soon as possible.As an honest seller,we are always open to hear and solve any disputes/dissatisfactions from our "Kings".Your Satisfaction,Our Pursuit