The Halo series of bearings are a high quality steel/chrome bearing with metal shields. These bearings have been tested and proven by many racers. Check your manual for the correct size for you vehicle if you are not certain.
METRIC: 3mm (Inner) x 9mm (Outer) x 4mm (Width)
STANDARD: 0.11811" (Inner) x 0.35433" (Outer) x 0.15748" (Width)