The 4x11x4 Ceramic Metal (694ZZC) Halo series of bearings are a high quality steel/chrome bearing with metal shields and silicone nitride ceramic balls (Si3N4). These bearings have been tested and proven by many racers.
4x11x4 Ceramic Metal (694ZZC) Halo bearing by Avid Racing Concepts is most commonly used in the LRP and Tekin brushless motors. Check your manual for the correct size for your motor if you are not certain.