【size】 US3---Diameter 14.1mm (equivalent to No. 4) US4---diameter 14.9mm (equivalent to size 6) * There is an error of 0.1 mm from Japanese size.
【material】 polyamide plastic *It will be a work using a 3D printer. Although it is a light, flexible and strong material, it can be intentionally folded by human effort, so please handle it with care.
