The shell button, also known as the real beyle button, is a very old button. Shell buttons are elegant and glossy, making the shell buttons always chosen by the public. Sharp-tailed snails: also known as horseshoe snails. They are white-colored shellfish that have been used to make buttons since ancient times. Now most of the Auschw shell buttons are made using this type of shell. Abalone shellfish: The shell surface of this shell is uneven, with a thin filament-like twill on the back, the surface color is pearl-colored, but the thickness of the shell is thin but the texture is very hard. This is a shell button developed exclusively by Ao Shiqi. Market Not much to see. Pearl oyster shell: distributed in the tropical and subtropical waters, generally black whiting, white butterfly shell, penguin shellfish, freshwater pearl shell and so on. The shell of mother of pearl is hard, almost round or direction, the shell surface is usually gray, yellow brown, green brown, but the interior reveals a beautiful pearl luster. Martensii: The English name is Japanese pearl oyster, which is currently cultured in Japan. Marshmallow's shiny, delicate texture is particularly suitable for use with gloves and boots. According to the button size: 6.5#, 8#, 9#, 10#, 11.5#, 13#, 15#, 18#, 21#, 25#, 28#, etc., using the changing formula: Diameter = Model * 0.635mm , we can know the diameter of any button. (Note: Generally not applicable to profiled buckles) According to the unit L (lignes, this word comes from French): from 1L=0.625mm, 1†(inches)=25.4mm, we can perform conversions such as: 12L=7.5mm=0.295†/ 14L=8.75mm=0.344†/ 16L=10mm=0.393†Want to learn more about buttons: accessible Textile Fabric,Traditional Fabric,Kashmir Fabric,Classical Fabric Wujiang wanwangTextile Co.Ltd , https://www.viscose-fabric.com