This is a sanshin bag. It was made from an antique juban fabric roll. It contains a blend of synthetic fibers. The parts that look black are navy blue. Since the fabric was thin, I added a lining, so I think it's durable. The lining is dark navy and made of synthetic fibers. The opening is wider than commercially available ones. If you put the tenjin (headstock) part in like a hood, it should fit without sticking out. I think it will be easy to put in and take out. My sanshin is a standard type, 79cm tall. This is a handmade item made by an amateur as a hobby, so thank you for your understanding.