Inner diameter: Approximately 6cm, Opening: Approximately 0.6cm *Please note that there may be slight variations due to amateur measurements. 【Requests】 ・If there are any problems with the delivered product, please contact us before leaving a review. (We cannot address issues after a review has been submitted.) ・The color of the actual product may differ slightly from the photos due to your monitor settings and lighting during photography. ・We will ship with simple packaging. As a result, there may be creases or marks. 777@568