The R1 Concepts drilled brake rotor for 2004–2010 BMW 525i (rear left) is a black, drilled replacement rotor specified for the rear left position. The description identifies this part as the left rear drilled rotor for that model and year span, with the drilled surface and black finish noted. Check vehicle year and wheel side to confirm this rotor matches your 525i rear-left application.
R1 04-10 BMW 525i Rear Left Drilled Black Brake Rotor