1. Not only has function of valve retainer, but in the course of valve opening and closing can forcibly make valve rotate around its axis, and make valve seat, valve guide grind each other and wear evenly to remove carbon deposit in between.

2. It can prevent "air leakage" or "snap".

3. It make the valve heated and radiate evenly.

4. It reduce thermal stress, and can prevent valve "torsion", "wrap".

5. On the same condition, valve service life extended 3 times as the old generation.