Size: 12mm Inner diameter: 17cm Please understand that there may be slight color differences between the photos and the actual product. The photos were taken outdoors in sunlight. No color processing has been done. Please check the images for inclusions and black spots. We have set the price as low as possible, so we are unable to offer discounts on single items. Please be sure to read the self-introduction before purchasing. We offer a combined purchase discount (excluding auctions). If you would like to request a discount, please state your desired price based on the discount amount listed in the self-introduction section. We are unable to accept requests for prices other than those specified, so please understand. m(_ _)m We have many other items for sale! ♪♪