Imported1.HIGH QUALITY MATERIAL:Environmentally Zinc alloy Hypoallergenic materials Suitable For Sensitive Skin.4.2cm*1.9 adjustable chain fit all hands,weight:8g.2.JEWELRY THAT PROMOTES HAPPINESSOur molecule necklace promotes happiness and well-being- We turned serotonin's chemical structure into a modern and intriguing piece of jewelry.Feel great when you wear or gift this happiness necklace,This piece offers a subtle way to remind yourself to be happy.3.PERFECT GIFT FOR HERThese interesting molecular jewelry are suitable for girls who love science. Its also a fitting college or high school graduation jewelry gift for aspiring scientists or chemists. Perfect as science gifts for teachers!This fashion jewelry is not only perfect for daily wear,also you can give it directly as a gift to your lover, wife, girlfriend, daughter, granddaughter and Your friend.4.PACKAGING UPGRADEALYLY offers an exquisite beautiful envelope package Or flannelette bag packaging for each customer who has placed orders,The upgraded packaging is perfect for gift giving,Giving to a girlfriend or family or friends will make look Pretty chic.This will definitely win the other person's heart.5.WARM AFTER-SALES SERVICEALYLY guarantees to every customer, If you run into any problemsJust contact us contact us within 30 days, and we'll refund your money back or give you a new pair