Auto timing belt: The auto timing belts our company produced have scratch performance, little extending rate to crook and able to bearing fine, the high advantage of brute force, still able to anti oil, anti heat, is able to bear fine performance, such as ozone, resisting full of crackly, etc..ZA ZB ZH YH ZR YS ZS YA ZAS ZBS S8M&YU FS MY MR RU ZLB