Suitable Size: about US Size 5-14,about 16/17/18/19/20/21/22/23mm inner,4mm wide,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 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 16pcs Stainless Steel Rings: You will receive 16 stainless steel rings. With a black velvet bag, it is suitable for gift giving and self use. The golden color is very classic and fashionable. It is easy to match your various clothes and is very suitable for attending formal occasions. 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. Meaningful Gifts: You can engrave names, sweet words or your love in the ring to make unique rings and send them as gifts to your lovers, friends or families to express your wish. They will be surprised and moved.