1.charm 925 sterling silver necklace; 2. non-toxi silicone necklace; 3. negative ion energy elements added. product descriptionpendant material925 silver necklacemould NoSHY-010strap materialsilicone necklace or high elasticity nylonelementsAnionoriginGuangdong (China)products featurehelpful for promoting blood circulation,activating collaterals,eliminating fatigue.