These are high-quality buttons used by designer brands and factory brands. They have a beautiful color with light blue to green marbling. There are individual differences. Approximately 20mm Approximately 15mm 25 pieces each There are individual differences due to the natural materials. I believe the material is nut button, but please note that there is a possibility of other materials. Not only for replacing buttons on brand-name items, but also on Uniqlo and fast fashion items, replacing the buttons will give them a more luxurious feel. I hope someone will use them.