This is a long bag for a medium-neck (nakazao) shamisen or a thin-neck (hosozao) shamisen. It's a long-term storage item, but it was made from unsewn, high-quality silk habutae fabric. I believe it's a type of wax-resist dyeing. The pattern is eye-catching. The lining is unused beige satin fabric. It seems like it will slide well. This is a handmade item created as a hobby, so thank you for your understanding.