economic semi-metallic formula with mileage 30000-40000kms anti-wear semi-metallic formula with mileage 40000-60000kms near OE formula with mileage 60000-80000kms Our products has passed certification of E-MARK and test of LINK and GREENING. And our friction materials passed LINK Examination ,VESC-3 Certificate in USA, ECE R90 regulation in Europe in 2007.