Porsche Red Racing Brake Disc Key Chain Reproduction of the Porsche brake disc and caliper. This die-cast metal 1-1/4 inches miniature brake disc keychain features a rotor that actually rotates within the brake caliper. The rotor surfaces are fitted with photo-etched stainless steel plates that have been manually brushed to simulate hairline braking marks. Omega ring for keys. Brand New official Porsche product.