These Textar brand pads are OEM for Mercedes Benz, Porsche, and other high end European models. They are heavy and high quality. Also, the friction material is much thicker than other brands so they will last longer. The pads were packaged with replacement caliper mounting bolts, which were treated with a thread locking compound, a nice benefit. The friction material is a "low-metallic" compound which in testing, were found to deliver superior stopping power when compared to semi-metallic or ceramic pads. This is why they are used in so many high performance and luxury models, to provide better braking and safety! This compound may produce some extra brake dust that leaves a film on your wheels, but the extra stopping power is worth it!