Circumference: Approximately 17.5cm (elastic due to rubber) *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 respond to issues reported after a review has been left.) ・The color of the actual product may differ slightly from the photos due to your monitor or the lighting used during photography. ・We will ship in simple packaging. s939@608