Stainless Steel Material: Made of high-quality stainless steel. Stainless steel jewelry is rust proof,discoloration, hypoallergenic, and won't make your fingers uncomfortable. It has a lot of service life, so don't worry about its quality Finger Ring Settings: about US Size16/17/18/19/20/21/22/23mm, 8mm, Ring Groove: 4.3/2mm, 16pcs;This simple ring can not worry about the unsuitable problem, The right width is very suitable for your DIY, and you can enjoy the joy of DIY Easy to Use: The ring core blanks are designed with groove settings for inlay crafts. You can inlay curb chain, stones, rhinestone, diamond, crushed opal, wood, chip gemstones etc to DIY personalized finger rings. 16pcs Stainless Steel Rings: You will receive 16pcs stainless steel rings. With a black velvet bag, it is suitable for gift giving and self use. The color is very classic and fashionable. 2 Styles: We have two different grooves, one is a double groove design and the other is a single groove design. You can receive two different DIY fun optionsblack classic colorIt is easy to match your various clothes and is very suitable for attending formal occasions.