Genuine Shell Button (4 holes) Type 17, with a raised edge Size: 23mm Unlike common polyester materials, this button features a subtle rainbow iridescence that shifts with the angle of light. Used in women's brand manufacturers and high-end ladies' wear. The back of the genuine shell button has red or pink patterns. (See photo 2) Made in Japan #ShellButton #Button #ShellButton #AccessoryParts #Handmade