1.Size and weight: chain perimeter 16+4cm, 4.5g. 2.Material and technique: copper, electroplating. 3.Function: radiation-protection. 4.Applications: ideal gift choice, couples jewelry, anniversary jewelry, boyfriend gifts, girlfriend gifts. Makes a perfect couples gift for anniversaries, birthdays, weddings, Valentine’s Day, Christmas,Honeymoon, or Just Because! 5.Jewelry care: storing in jewelry box, avoiding contact with oily hard substances and chemicals, cleaning with warm water, wiping with soft cloth and do not wearing when bathing.