Width: Approximately 11.5mm Thickness: Approximately 2mm, with a 0.5-1cm indentation in the center. Approximately 40 pieces in total. Due to the natural materials, the shape, color, pattern, and size will vary. The thickness is also not uniform. They are prone to scratches, so there may be scratches. Especially on the back. The color may differ slightly from the photos. These have been stored for a while. Please purchase if you understand this. Slightly more in stock.