These are pure copper kada made up of authentic copper. glossy superior finish. different designs available please select your choice. They are preferred by collegians, corporates, proffessionals etc. comfort fit. Over a period of time it you find them blackening then dont worry blackening is a natural property of original copper, since the environment affects its surface it starts blackening, clean with dry pitabari powder or Bhaiyya powder or any other utensil powder. rub the surface of kada with one of these powders. you will see that it starts glowing instantly.