1. Birth year number with adjustable chain, 18-20 inches in length. You can easily adjust the length of golden years with the lobster buckle. _x000D_2. 18K gold plated birth year necklace is made of high quality copper. It does not contain nickel and lead. It will not fade, rust, stain, corrode or turn skin green, which is good for skin and nature. _x000D_3. Necklaces for parties, dynamic dances, weddings, ceremonies, graduations, dates, beaches, camping, vacations, family gatherings and everyday wear. _x000D_4. You can make it the perfect gift for friends, family and loved ones on memorable occasions such as birthdays, anniversaries, Christmas, Valentine's Day and more.