Transform your daily drive using R1 Concepts Brake Disc. Headquartered in Los Angeles, California, USA. 2002 Blackwood Base. R1 Concepts Brake Disc –. R1 CONCEPTS BRAKE DISC. OEM Specifications: Formulated with G3000/G11H18 cast iron specification, these premium brake rotors are engineered to match OEM specifications for durability, reliability, and stability.