Belian is the product of a single species, Eusideroxylon zwageri, in Sabah and Sarawak. The timber seasons slowly witb a tendency for checking and splitting.
- Density: 835-1,180 kg/m3
- Heartwood: light brown to almost bright yellow when freshly but darkens on exposure to a deep reddish brown, becoming very dark brown, or even black with age.
- Sapwood: well defined by colour
- Texture is moderately fine to fine and even
- Grain is straight