This design button features a disc shape with a glossy gray color and a very delicate grid pattern carved into it. The surface has an elegant glossy gray finish, while the back is matte gray. Each side of the grid pattern is about 0.5mm... It's too fine to measure with a regular ruler. It's a wonderful button that is simple yet shows attention to detail. Size: 13mm Thickness: Approximately 2mm at its thickest Quantity: 20 pieces I am selling 20 new buttons from a bulk purchase for handmade projects. The material is polyester resin, which is durable. I have more available. You can add more for 10 yen each.