The fabric used is a cobran fabric. When using thin fabric, interfacing is applied to the outer fabric. A 10.5cm clasp is used. The clasps are purchased from a clasp supplier. Size: Approximately 13.5cm wide at the center, 10cm high, and 3cm deep. Please allow for slight measurement誤差. Various unused cotton fabrics are used for the lining, depending on the color and material. Please examine the photos carefully before considering a purchase. This is a one-of-a-kind item.