R1 Concepts eLINE Series Drilled & Slotted Brake Rotors. Designed for Drivers Seeking OE Brake Performance with Addtional Rust Protection Headquartered in Los Angeles, California, USA. OEM Specifications: Formulated with G3000/G11H18 cast iron specification, these premium brake rotors are engineered to match OEM specifications for durability, reliability, and stability.