Loose Ceramic Balls 30mm G40 ZRO2, this is a popular size that could be used in many Bicycle, or any application that uses this size 30mm. Balls are made of Ceramic ZRO2.

• Item: Loose Balls
• Type: Ceramic Balls
• Material: Zirconia Ceramic (ZrO2) (Zirconium dioxide)
• Size: 30mm
• Quantity: One Ball Bearing