About this product Metal: 316L stainless steel. Health certification does not contain lead and other harmful elements, is hypoallergenic and comfortable to wear; These wave rings are sturdy, non-deformable, waterproof and sweat-proof. We use vacuum plating to make them not easy to fade. The inner surface is highly polished and smooth, making it comfortable to wear; One order contains 3 black rings of the same size. You can layer them or wear them individually. Regular wave rings can be used as stacking rings, knuckle rings, thumb rings, medium rings, or can be used with other rings; Includes a black velvet bag printed with brand name. It is a perfect gift for many occasions, such as Valentine's Day, Christmas, Thanksgiving, Mother's Day, lover, wife, fiance, girlfriend, daughter, birthday, anniversary, wedding, engagement, etc. We are committed to providing the best service to our customers. If you have any quality issues, please feel free to contact us.