This is a paulownia wood body board for the shamisen. Ideal for protecting the skin. Sizes available for hosozao (thin neck), chuzao (medium neck), and futozao (thick neck) shamisen. All boards have some warping, but this should not cause any particular problems during use. *Please refrain from purchasing if you are overly concerned about details or tend to voice various opinions after receiving the item. We will not answer questions regarding size. Please consider purchasing only if you understand this.