This item was purchased on Mercari. I am selling it because I have no use for it. Sizes: Pink, Blue approx. 18mm, Black approx. 20mm Please note that there may be slight variations in size due to personal measurement. Please be aware that the color may appear slightly different in the photos compared to the actual item due to the shooting environment and room lighting. As this is a vintage item, there may be some minor scratches and stains. Please understand this before purchasing.