Stainless Steel Material: Made of high-quality stainless steel. Stainless steel jewelry is rust proof,discoloration, and won't make your fingers uncomfortable. It has a lot of service life, so don't worry about its quality Easy to Use The ring core blanks are designed with groove settings for inlay crafts, suitable for DIY adding chains, stones, crushed crystals, mini pearls, rhinestones, resin, sequins, shells, lucky numbers, inspirational words, etc. You can make different styles of rings according to your preferences. Multi Grooved DesignThe 6-groove ring is different from other styles in the market, and you can add more luster to the ring according to your preferences. A unique ring gift will bring you joy, suitable for any occasion Black Color: Black very classic and fashionable,These ring core colors have good gloss, good color, different from other colors in the marketcan keep the luster for a long time without fading, and are also suitable for people with sensitive skin! Finger Ring Settings: about 16/17/18/19/20/21/22/23mm inner diameter,8mm wide wide, groove: 0.9mm, 16pcs;The right width is very suitable for your DIY, and you can enjoy the joy of DIY