How to choose biomass wood pellet fuel for wood pellet stove?

What kind of fuel is suitable for biomass wood pellet stoves?
The wood pellet stoves we produce can use 6mm or 8mm diameter wood pellets. It is recommended to use impurity-free wood pellets, such as pine, birch, redwood, palm wood and other wood pellets with high calorific value. As one of the new clean energy sources, biomass fuel has the characteristics of smokeless, high heat and low cost.