A is typically made of Paulownia wood (known as ), although treatment of the wood varies tremendously between artisans. may or may not be adorned. Adornments include inlays of ivory and ebony, tortoise shell, metal figures, etc. The wood is also cut into two patterns, (also called ), which has a swirling pattern, or straight-lined . The straight lined pattern is easier to manufacture, so the swirl raises the cost of production, and is therefore reserved for decorative and elegant models.