Loose 2mm Tungsten Carbide Ball Bearings 2mm inch = 0.0787 inch G25 One Loose Balls One Loose 2mm Tungsten Carbide Ball Bearings Balls are made of tungsten carbide Balls size is 2mm Grade is G25 And it meets grade 25 sphere tolerancem Loose Ball is extremely hard alloy made from tungsten and carbon And it is high corrosion wear resistance.