... , wheat straw etc. Everything which can be burning.6. Specification of the mould: 4mm, 6mm, 8mm, 10mm, 15mm ... change the mould)7. The diameter of the pellet is 4#,6#,8#,10#,15# with cylindrical shape ... , the length of the pellet is ... disadvantages( holding machine) pellet machine, the quality of finished pellet fuel is harder and combustion values ...