Size: about 10 cm Weight (single): about 2.6g Material: glass alloy Handmade will have hand-made traces, customized for 5 days. The problem of online shopping color difference can not be avoided, please think twice before shooting. How to maintain: Wipe the sweat after wearing it and keep it away from light. Avoid physical hits and external pulls. It is not recommended to wear for sports. Custom ear clip style, or have any questions, please communicate with us.