Sing Heng Seng Co., Ltd. provides a selection of coal from Sub Bituminous  to Bituminous. Sub Bituminous – Bituminous coal are typically softer, friable materials with a dull, earthy appearance.

Sub-bituminous coal ::
1. 5100 - 5300 kcal/kg
2. 5300 - 5500 kcal/kg

Bituminous coal :: 
3. 5900 kcal/kg
4. 6300 kcal/kg