These are design buttons. The size is 20mm. They are new and unused, but have been stored for a long time in a closed-down handicraft store. Please refrain from purchasing if you are concerned. Not sold individually. We also have the same design in 27mm (90 yen, 12 in stock), 23mm (80 yen, 13 in stock), and 18mm (60 yen, 8 in stock).