Inner diameter: Only sizes 14-16 can be downsized. Size: 11mm Parts: Uses zirconia Not suitable for those with metal allergies ( ´._.`) As these are completely handmade, please understand before purchasing. *Please confirm the images carefully and make your own judgment. If you have any questions or concerns, please ask before purchasing. Returns, refunds, and exchanges are not accepted after arrival. I am a handmade seller! Please understand. If you are looking for perfection, please purchase from a shop. The price includes shipping, packaging, and handling fees. Discounts are not offered during time sales. Normally, if you would like a discount for multiple purchases, please leave a comment. m(_ _)m Requests without a comment will be rejected. Please also read the profile (PF) (♡ᴗ͈ˬᴗ͈) I do not accept custom orders, so significant design changes may incur additional charges. Please consult with me. m(_ _)m Cancellations due to design changes after purchase will not be accepted.