Thank you for viewing our product. The size is as follows: ○ Inner diameter: Approximately 16cm ○ Bead diameter: Approximately 6.5mm After purchase, we will purify the item and then arrange for shipping. ※ Size adjustment (smaller only) is also available for an additional 300 yen, so please feel free to contact us. ※ Although it is a new and unused item, there may be natural or processing-related scratches as it is a one-of-a-kind item. ※ Bead diameters vary, so there may be a deviation of ±1mm.