Thank you very much for viewing. This is a high-quality koma (bridge) made by Ishii for jiuta shamisen. The details of the material are unknown. Please make your judgment based on the images. The ends of the string grooves are chipped. This does not affect the sound. We are waiting for your purchase if you don't mind. Height: 1.2mm Width: 7.1mm Weight: 4.1g Instant purchase is also welcome.