※ I also have other shell buttons for sale. These are natural shell buttons (black butterfly flat). Also known as black butterfly dish. Size: 10mm The rainbow colors change depending on the type of light and the viewing angle, which is unique to black butterfly shells. The authentic texture is different from regular polyester buttons. Used in brand products, etc. ☆ Due to shipping, the buttons may occasionally break, so I will include spares. #buttons #shell buttons #shell buttons #accessory parts #handmade