4x11x4 Metal (694ZZ) Halo bearing by Avid Racing Concepts is most commonly used in the brushless motors. Check your manual for the correct size for you motor if you are not certain.
Motors Used In
LRP: X-12 Modified (Takes two 4x10x4) (Stock motor takes 4x11x4's)
Bearing Dimensions
METRIC: 4mm (Inner) x 11mm (Outer) x 4mm (Width)
STANDARD: 0.15748" (Inner) x 0.43307" (Outer) x 0.15748" (Width)