(Red) LED magic tricks Thumb Tip Magic party goods set of two thumb shining 2 role in one (japan import) new article, light red the size of the finger: 5cm x 2.5cm inner diameter: 2.5cm There is the case that some errors occur in the inner diameter size and by Thumb Tip. Yes example replacement battery attachment : This is a test for the last (CR1220 button battery use) .