These are shell buttons that were used on clothing. Size: Diameter: 10mm Thickness: 2mm Please note that due to the natural material, there may be variations in thickness, color, and slight imperfections. ☆ There may be natural variations and imperfections. ☆ These are decorative buttons, so please avoid high heat and ironing. ☆ These have been stored at home and inspected by a non-professional. Please understand the above before purchasing. They will be shipped via Yu-packet Post Mini. Thank you for looking.