Thank you for viewing. Size: Approximately 11.5cm x 8.1cm x 5.2cm With a large insho (seal bed), you can accommodate a wide range of sizes, from small seals to large ones. It can handle up to 6.5cm square seal materials. It can accommodate up to 4.3cm of clamping. This is an essential item for performing tenkoku (seal carving). An insho (seal bed) firmly secures the seal material by clamping it, allowing you to carve with a tenkoku knife. Especially for beginners, please be sure to use an insho. If you only plan to carve small seals, we recommend a small size. If you plan to carve large seal materials, we recommend a large size. If you have any questions, please feel free to comment.