The EBC 01-03 BMW 525i 2.5 (E39) Yellowstuff Front Brake Pads are a high-performance brake pad set designed for the BMW 525i 2.5 (E39) model. These pads are made from a material known as Aramid fiber, which is a strong and durable synthetic fiber that is designed to provide superior braking performance. The pads also feature EBC's patented Yellowstuff compound, which offers increased stopping power and improved heat dissipation. These pads are designed to provide better braking performance than the stock pads and are ideal for track and race applications.