The sphere cushion and able to bear the sealed material graphite of high temperature to pass the special place the metal silk screen pay attention to die casting but succeed, There is very good compression elasticity, the system is idea that exhaust First-selected special-purpose seal.The sphere cushion surface is dealt with by the ceramic, have good lubrication and seal even more Result, make the vehicle dispel and rub sound completely in advancing, domestic head of this technology Create!