- Original product from PROJECT MU - Friction coefficient: 0.36~0.41μ - Rotor temp: 0~400 ℃ - NS400 Street brake pads for street use. - Rear Brake Pads 1 Pair - Non-Steel and Asbestos free - Part No: Pma8503 - AUDI (Rear) A4/S4/A5/S5/RS5 (B8 Model) - Dimension 116.4 x 58.9 x T16.4 / 17.20 mm