65 Loose Ball Bearings 5/32 inch = 3.962mm Ceramic Balls 10 Balls 65 Loose Ceramic Balls 5/32 inch 3.962mm G16 ZRO2, this is a popular size that could be used in many Bicycle, or any application that uses this size 5/32 Inch. Balls are made of Ceramic ZRO2 .