VXB™ Brand Loose Ball Bearing 9mm = 23/64 Inch Ceramic Balls (Si3N4) One Ball Loose Ceramic Balls 9mm Si3N4 this is a popular size that could be used in many Bicycle Balls are made of Ceramic Si3N4. Item: Loose Balls Size: 9mm (23/64 Inch) Material: Ceramic (Si3N4) Quantity: One Balls VXB Category: Loose Ceramic Balls 9mm Loose Ceramic Balls G5 Si3N4 Bearing Balls Kit13323
