Material description: This design uses 316L white steel for medical use- It has the characteristics of high hardness, no deformation, no corrosion, no color change, no fading, no allergies, no oxidation, both fashion and practicality. (Small reminder: The body including the ear pin are made of medical steel. If the ear clip needs to be changed, it is a general metal. Please consider it if you have allergies ~~) Maintenance The maintenance of 316L white steel jewelry is very simple, just wipe it with a fine cotton cloth to keep it shiny. If there is dirt on the surface, You can use warm water and take a fine cotton cloth with neutral detergent to gently clean, then dry after cleaning.