This is a package of ten 3mm Ceramic Nitride Differential Balls from 3 Racing 

FEATURES: Ceramic Nitride construction, black in color
Grade 5 diamond polished for low rotational mass
79% lighter than Tungsten Carbide and stronger
Each pack is matched for consistent concentricity, roundness and
smoothness
will not melt or shatter under extreme racing conditions

INCLUDES: 12pcs 3mm diameter Ceramic Differential Balls

REQUIRES: Installation

SPECS: Diameter: 3mm